Update of obipcr and homogenization of logging

Former-commit-id: 46abf47c19ace5248042c02cf1f81d9f6c12eb10

Release-notes.md

@@ -2,6 +2,20 @@
 
 ## Latest changes
 
+### CPU limitation
+
+- By default, *OBITools4* tries to use all the computing power available on your computer.
+  In some circumstances this can be problematic (e.g. if you are running on a computer 
+  cluster managed by your university). You can limit the number of CPU cores used by 
+  *OBITools4* or by using the **--max-cpu** option or by setting the **OBIMAXCPU** environment 
+  variable.
+  Some strange behaviour of *OBITools4* has been observed when users try to limit the maximum 
+  number of usable CPU cores to one. This seems to be caused by the Go language, and it is not 
+  obvious to get *OBITools4* to run correctly on a single core in all circumstances. Therefore, 
+  if you ask to use a single core, **OBITools4** will print a warning message and actually set 
+  this parameter to two cores. If you really want a single core, you can use the 
+  **--force-one-core** option. But be aware that this can lead to incorrect calculations.
+
 ### New features
 
 -   A new option **--version** has been added to every obitools command.
@@ -9,9 +23,26 @@
 -   In `obiscript` a `qualities` method has been added to retrieve or set the quality scores from a
     BioSequence object.         
 
+### Enhancement
+
+-   In every *OBITools* command, the progress bar are automatically deactivated when the 
+    standard error output is redirected.
+-   Because Genbank and ENA:EMBL contain very large sequences, while OBITools4 are optimized
+    As Genbank and ENA:EMBL contain very large sequences, while OBITools4 is optimised for 
+    short sequences, `obipcr` faces some problems with excessive consumption of computer 
+    resources, especially memory. Several improvements in the tuning of the default `obipcr` 
+    parameters and some new features, currently only available for FASTA and FASTQ file readers, 
+    have been implemented to limit the memory impact of `obipcr` without changing the 
+    computational efficiency too much.
+-   Logging system and therefore format, have been homogenized.
+
 ### Bug
 
 -   In `obitag`, correct the wrong assignation of the **obitag_bestmatch** attribute.
+-   In `obiclean`, the **--no-progress-bar** option desactivate all the progress bars, 
+    not only the data are read.
+-   Several corrections in reading of FASTA and FASTQ files including some code 
+    simplifications and factorisation.
 
 ## April 2nd, 2024. Release 4.2.0
 

cmd/obitools/obipcr/main.go

@@ -27,6 +27,8 @@ func main() {
 
 	obioptions.SetWorkerPerCore(2)
 	obioptions.SetReadWorkerPerCore(0.5)
+	obioptions.SetParallelFilesRead(obioptions.CLIParallelWorkers() / 4)
+	obioptions.SetBatchSize(10)
 
 	optionParser := obioptions.GenerateOptionParser(obipcr.OptionSet)
 

go.mod

@@ -26,6 +26,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
+	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.6.1 // indirect
 )

go.sum

@@ -42,6 +42,8 @@ github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZ
 github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 h1:onHthvaw9LFnH4t2DcNVpwGmV9E1BkGknEliJkfwQj0=
+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58/go.mod h1:DXv8WO4yhMYhSNPKjeNKa5WY9YCIEBRbNzFFPJbWO6Y=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=

pkg/obiformats/batch_of_files_reader.go

@@ -1,7 +1,7 @@
 package obiformats
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"

pkg/obiformats/embl_read.go

@@ -179,7 +179,8 @@ func ReadEMBL(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 		newIter.Add(1)
 		go _ParseEmblFile(opt.Source(), entry_channel, newIter,
 			opt.WithFeatureTable(),
-			opt.BatchSize(), opt.TotalSeqSize())
+			opt.BatchSize(), 
+			opt.TotalSeqSize())
 	}
 
 	go func() {

pkg/obiformats/fastaseq_read.go

@@ -9,7 +9,6 @@ import (
 	"slices"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
-	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 
@@ -43,7 +42,11 @@ func _EndOfLastFastaEntry(buffer []byte) int {
 
 func _ParseFastaFile(source string,
 	input ChannelSeqFileChunk,
-	out obiiter.IBioSequence) {
+	out obiiter.IBioSequence,
+	no_order bool,
+	batch_size int,
+	chunck_order func() int,
+) {
 
 	var identifier string
 	var definition string
@@ -56,7 +59,7 @@ func _ParseFastaFile(source string,
 
 	for chunks := range input {
 		scanner := bufio.NewReader(chunks.raw)
-		sequences := make(obiseq.BioSequenceSlice, 0, 100)
+		sequences := make(obiseq.BioSequenceSlice, 0, batch_size)
 		for C, err := scanner.ReadByte(); err != io.EOF; C, err = scanner.ReadByte() {
 
 			is_end_of_line := C == '\r' || C == '\n'
@@ -130,6 +133,12 @@ func _ParseFastaFile(source string,
 					s := obiseq.NewBioSequence(identifier, slices.Clone(seqBytes.Bytes()), definition)
 					s.SetSource(source)
 					sequences = append(sequences, s)
+					if no_order {
+						if len(sequences) == batch_size {
+							out.Push(obiiter.MakeBioSequenceBatch(chunck_order(), sequences))
+							sequences = make(obiseq.BioSequenceSlice, 0, batch_size)
+						}
+					}
 					state = 1
 
 				} else if !is_sep {
@@ -145,10 +154,13 @@ func _ParseFastaFile(source string,
 		}
 
 		if len(sequences) > 0 {
-			log.Debugln("Pushing sequences")
+			if no_order {
+				out.Push(obiiter.MakeBioSequenceBatch(chunck_order(), sequences))
+			} else {
 				out.Push(obiiter.MakeBioSequenceBatch(chunks.order, sequences))
 			}
 		}
+	}
 
 	out.Done()
 
@@ -158,14 +170,19 @@ func ReadFasta(reader io.Reader, options ...WithOption) (obiiter.IBioSequence, e
 	opt := MakeOptions(options)
 	out := obiiter.MakeIBioSequence()
 
-	source := opt.Source()
+	nworker := opt.ParallelWorkers()
 
-	nworker := obioptions.CLIReadParallelWorkers()
 	chkchan := ReadSeqFileChunk(reader, _EndOfLastFastaEntry)
+	chunck_order := obiutils.AtomicCounter()
 
 	for i := 0; i < nworker; i++ {
 		out.Add(1)
-		go _ParseFastaFile(source, chkchan, out)
+		go _ParseFastaFile(opt.Source(),
+			chkchan,
+			out,
+			opt.NoOrder(),
+			opt.BatchSize(),
+			chunck_order)
 	}
 
 	go func() {

pkg/obiformats/fastqseq_read.go

@@ -184,7 +184,11 @@ func lastFastqCut(buffer []byte) ([]byte, []byte) {
 func _ParseFastqFile(source string,
 	input ChannelSeqFileChunk,
 	out obiiter.IBioSequence,
-	quality_shift byte) {
+	quality_shift byte,
+	no_order bool,
+	batch_size int,
+	chunck_order func() int,
+) {
 
 	var identifier string
 	var definition string
@@ -311,6 +315,14 @@ func _ParseFastqFile(source string,
 						q[i] = q[i] - quality_shift
 					}
 					sequences[len(sequences)-1].SetQualities(q)
+
+					if no_order {
+						if len(sequences) == batch_size {
+							out.Push(obiiter.MakeBioSequenceBatch(chunck_order(), sequences))
+							sequences = make(obiseq.BioSequenceSlice, 0, batch_size)
+						}
+					}
+
 					state = 11
 				} else {
 					qualBytes.WriteByte(C)
@@ -328,11 +340,15 @@ func _ParseFastqFile(source string,
 		}
 
 		if len(sequences) > 0 {
-			log.Debugln("Pushing sequences")
+			if no_order {
+				out.Push(obiiter.MakeBioSequenceBatch(chunck_order(), sequences))
+			} else {
 				out.Push(obiiter.MakeBioSequenceBatch(chunks.order, sequences))
 			}
 		}
 
+	}
+
 	out.Done()
 
 }
@@ -341,15 +357,20 @@ func ReadFastq(reader io.Reader, options ...WithOption) (obiiter.IBioSequence, e
 	opt := MakeOptions(options)
 	out := obiiter.MakeIBioSequence()
 
-	source := opt.Source()
+	nworker := opt.ParallelWorkers()
+	chunkorder := obiutils.AtomicCounter()
 
-	nworker := obioptions.CLIReadParallelWorkers()
 	chkchan := ReadSeqFileChunk(reader, _EndOfLastFastqEntry)
 
 	for i := 0; i < nworker; i++ {
 		out.Add(1)
-		go _ParseFastqFile(source, chkchan, out,
+		go _ParseFastqFile(opt.Source(),
-			byte(obioptions.InputQualityShift()))
+			chkchan,
+			out,
+			byte(obioptions.InputQualityShift()),
+			opt.NoOrder(),
+			opt.BatchSize(),
+			chunkorder)
 	}
 
 	go func() {

pkg/obiformats/fastseq_obi_header.go

@@ -3,12 +3,13 @@ package obiformats
 import (
 	"bytes"
 	"fmt"
-	"log"
 	"math"
 	"regexp"
 	"strconv"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 	"github.com/goccy/go-json"

pkg/obiformats/fastseq_write_fasta.go

@@ -115,7 +115,7 @@ func WriteFasta(iterator obiiter.IBioSequence,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 	opt := MakeOptions(options)
 
-	iterator = iterator.Rebatch(1000)
+	iterator = iterator.Rebatch(opt.BatchSize())
 	file, _ = obiutils.CompressStream(file, opt.CompressedFile(), opt.CloseFile())
 
 	newIter := obiiter.MakeIBioSequence()

pkg/obiformats/fastseq_write_fastq.go

@@ -62,9 +62,8 @@ func WriteFastq(iterator obiiter.IBioSequence,
 	file io.WriteCloser,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 
-	iterator = iterator.Rebatch(1000)
-
 	opt := MakeOptions(options)
+	iterator = iterator.Rebatch(opt.BatchSize())
 
 	file, _ = obiutils.CompressStream(file, opt.CompressedFile(), opt.CloseFile())
 

pkg/obiformats/options.go

@@ -14,6 +14,7 @@ type __options__ struct {
 	total_seq_size        int
 	full_file_batch       bool
 	parallel_workers      int
+	no_order              bool
 	closefile             bool
 	appendfile            bool
 	compressed            bool
@@ -48,6 +49,7 @@ func MakeOptions(setters []WithOption) Options {
 		parallel_workers:      obioptions.CLIReadParallelWorkers(),
 		batch_size:            obioptions.CLIBatchSize(),
 		total_seq_size:        1024 * 1024 * 100, // 100 MB by default
+		no_order:              false,
 		full_file_batch:       false,
 		closefile:             false,
 		appendfile:            false,
@@ -101,6 +103,10 @@ func (opt Options) FormatFastSeqHeader() func(*obiseq.BioSequence) string {
 	return opt.pointer.fastseq_header_writer
 }
 
+func (opt Options) NoOrder() bool {
+	return opt.pointer.no_order
+}
+
 func (opt Options) ProgressBar() bool {
 	return opt.pointer.with_progress_bar
 }
@@ -205,6 +211,16 @@ func OptionsAppendFile(append bool) WithOption {
 	return f
 }
 
+func OptionNoOrder(no_order bool) WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.no_order = no_order
+	})
+
+	return f
+}
+
+
+
 func OptionsCompressed(compressed bool) WithOption {
 	f := WithOption(func(opt Options) {
 		opt.pointer.compressed = compressed

pkg/obiiter/limitmemory.go

@@ -0,0 +1,47 @@
+package obiiter
+
+import (
+	"runtime"
+
+	"github.com/pbnjay/memory"
+	log "github.com/sirupsen/logrus"
+)
+
+func (iterator IBioSequence) LimitMemory(fraction float64) IBioSequence {
+	newIter := MakeIBioSequence()
+
+	fracLoad := func() float64 {
+		var mem runtime.MemStats
+		runtime.ReadMemStats(&mem)
+		return float64(mem.Alloc) / float64(memory.TotalMemory())
+	}
+
+	newIter.Add(1)
+	go func() {
+
+		for iterator.Next() {
+			nwait := 0
+			for fracLoad() > fraction {
+				runtime.Gosched()
+				nwait++
+				if nwait%1000 == 0 {
+					log.Warnf("Wait for memory limit %f/%f", fracLoad(), fraction)
+
+				}
+				if nwait > 10000 {
+					log.Warnf("Very long wait for memory limit %f/%f", fracLoad(), fraction)
+					break
+				}
+			}
+			newIter.Push(iterator.Get())
+		}
+
+		newIter.Done()
+	}()
+
+	go func() {
+		newIter.WaitAndClose()
+	}()
+
+	return newIter
+}

pkg/obilua/lua_table.go

@@ -1,7 +1,7 @@
 package obilua
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
 
 	lua "github.com/yuin/gopher-lua"
 )
@@ -67,13 +67,13 @@ func Table2ByteSlice(interpreter *lua.LState, table *lua.LTable) []byte {
 			v := table.RawGetInt(i)
 			switch v.Type() {
 			case lua.LTNumber:
-				if x:=float64(v.(lua.LNumber)); x <=255 {
+				if x := float64(v.(lua.LNumber)); x <= 255 {
 					val[i-1] = byte(x)
 				} else {
-					log.Fatalf("LUA: Value %f at index %d is to large to be converted to byte", x,i)
+					log.Fatalf("LUA: Value %f at index %d is to large to be converted to byte", x, i)
 				}
 			default:
-				log.Fatalf("LUA: Value %v at index %d cannot be converted to byte", v,i)
+				log.Fatalf("LUA: Value %v at index %d cannot be converted to byte", v, i)
 			}
 		}
 

pkg/obioptions/options.go

@@ -16,6 +16,8 @@ import (
 var _Debug = false
 var _WorkerPerCore = 2.0
 var _ReadWorkerPerCore = 1.0
+var _StrictReadWorker = 0
+var _ParallelFilesRead = 0
 var _MaxAllowedCPU = runtime.NumCPU()
 var _BatchSize = 5000
 var _Pprof = false
@@ -31,9 +33,16 @@ func GenerateOptionParser(optionset ...func(*getoptions.GetOpt)) ArgumentParser
 	options.SetMode(getoptions.Bundling)
 	options.SetUnknownMode(getoptions.Fail)
 	options.Bool("help", false, options.Alias("h", "?"))
-	options.Bool("version", false)
+
-	options.BoolVar(&_Debug, "debug", false)
+	options.Bool("version", false,
-	options.BoolVar(&_Pprof, "pprof", false)
+		options.Description("Prints the version and exits."))
+
+	options.BoolVar(&_Debug, "debug", false,
+		options.GetEnv("OBIDEBUG"),
+		options.Description("Enable debug mode, by setting log level to debug."))
+
+	options.BoolVar(&_Pprof, "pprof", false,
+		options.Description("Enable pprof server. Look at the log for details."))
 
 	// options.IntVar(&_ParallelWorkers, "workers", _ParallelWorkers,
 	// 	options.Alias("w"),
@@ -43,6 +52,9 @@ func GenerateOptionParser(optionset ...func(*getoptions.GetOpt)) ArgumentParser
 		options.GetEnv("OBIMAXCPU"),
 		options.Description("Number of parallele threads computing the result"))
 
+	options.BoolVar(&_Pprof, "force-one-cpu", false,
+		options.Description("Force to use only one cpu core for parallel processing"))
+
 	options.IntVar(&_BatchSize, "batch-size", _BatchSize,
 		options.GetEnv("OBIBATCHSIZE"),
 		options.Description("Number of sequence per batch for paralelle processing"))
@@ -93,11 +105,20 @@ func GenerateOptionParser(optionset ...func(*getoptions.GetOpt)) ArgumentParser
 		// Setup the maximum number of CPU usable by the program
 		if _MaxAllowedCPU == 1 {
 			log.Warn("Limitating the Maximum number of CPU to 1 is not recommanded")
-			runtime.GOMAXPROCS(1)
+			log.Warn("The number of CPU requested has been set to 2")
-		} else {
+			SetMaxCPU(2)
-			runtime.GOMAXPROCS(_MaxAllowedCPU)
 		}
-		if options.Called("max-cpu") {
+
+		if options.Called("force-one-cpu") {
+			log.Warn("Limitating the Maximum number of CPU to 1 is not recommanded")
+			log.Warn("The number of CPU has been forced to 1")
+			log.Warn("This can lead to unexpected behavior")
+			SetMaxCPU(1)
+		}
+
+		runtime.GOMAXPROCS(_MaxAllowedCPU)
+
+		if options.Called("max-cpu") || options.Called("force-one-cpu") {
 			log.Printf("CPU number limited to %d", _MaxAllowedCPU)
 		}
 
@@ -119,74 +140,200 @@ func GenerateOptionParser(optionset ...func(*getoptions.GetOpt)) ArgumentParser
 	}
 }
 
-// Predicate indicating if the debug mode is activated.
+// CLIIsDebugMode returns whether the CLI is in debug mode.
+//
+// The debug mode is activated by the command line option --debug or
+// the environment variable OBIDEBUG.
+// It can be activated programmatically by the SetDebugOn() function.
+//
+// No parameters.
+// Returns a boolean indicating if the CLI is in debug mode.
 func CLIIsDebugMode() bool {
 	return _Debug
 }
 
-// CLIParallelWorkers returns the number of parallel workers requested by
+// CLIParallelWorkers returns the number of parallel workers used for
-// the command line option --workers|-w.
+// computing the result.
+//
+// The number of parallel workers is determined by the command line option
+// --max-cpu|-m and the environment variable OBIMAXCPU. This number is
+// multiplied by the variable _WorkerPerCore.
+//
+// No parameters.
+// Returns an integer representing the number of parallel workers.
 func CLIParallelWorkers() int {
-	return int(float64(_MaxAllowedCPU) * float64(_WorkerPerCore))
+	return int(float64(CLIMaxCPU()) * float64(WorkerPerCore()))
 }
 
+// CLIReadParallelWorkers returns the number of parallel workers used for
+// reading files.
+//
+// The number of parallel workers is determined by the command line option
+// --max-cpu|-m and the environment variable OBIMAXCPU. This number is
+// multiplied by the variable _ReadWorkerPerCore.
+//
+// No parameters.
+// Returns an integer representing the number of parallel workers.
 func CLIReadParallelWorkers() int {
-	return int(float64(_MaxAllowedCPU) * float64(_ReadWorkerPerCore))
+	if StrictReadWorker() == 0 {
+		return int(float64(CLIMaxCPU()) * ReadWorkerPerCore())
+	} else {
+		return StrictReadWorker()
+	}
 }
 
-// CLIParallelWorkers returns the number of parallel workers requested by
+// CLIMaxCPU returns the maximum number of CPU cores allowed.
-// the command line option --workers|-w.
+//
+// The maximum number of CPU cores is determined by the command line option
+// --max-cpu|-m and the environment variable OBIMAXCPU.
+//
+// No parameters.
+// Returns an integer representing the maximum number of CPU cores allowed.
 func CLIMaxCPU() int {
 	return _MaxAllowedCPU
 }
 
-// CLIBatchSize returns the expeted size of the sequence batches
+// CLIBatchSize returns the expected size of the sequence batches.
+//
+// In Obitools, the sequences are processed in parallel by batches.
+// The number of sequence in each batch is determined by the command line option
+// --batch-size and the environment variable OBIBATCHSIZE.
+//
+// No parameters.
+// Returns an integer value.
 func CLIBatchSize() int {
 	return _BatchSize
 }
 
-// DebugOn sets the debug mode on.
+// SetDebugOn sets the debug mode on.
-func DebugOn() {
+func SetDebugOn() {
 	_Debug = true
 }
 
-// DebugOff sets the debug mode off.
+// SetDebugOff sets the debug mode off.
-func DebugOff() {
+func SetDebugOff() {
 	_Debug = false
 }
 
+// SetWorkerPerCore sets the number of workers per CPU core.
+//
+// It takes a float64 parameter representing the number of workers
+// per CPU core and does not return any value.
 func SetWorkerPerCore(n float64) {
 	_WorkerPerCore = n
 }
 
+// SetReadWorkerPerCore sets the number of worker per CPU
+// core for reading files.
+//
+// n float64
 func SetReadWorkerPerCore(n float64) {
 	_ReadWorkerPerCore = n
 }
 
+// WorkerPerCore returns the number of workers per CPU core.
+//
+// No parameters.
+// Returns a float64 representing the number of workers per CPU core.
 func WorkerPerCore() float64 {
 	return _WorkerPerCore
 }
 
+// ReadWorkerPerCore returns the number of worker per CPU core for
+// computing the result.
+//
+// No parameters.
+// Returns a float64 representing the number of worker per CPU core.
 func ReadWorkerPerCore() float64 {
 	return _ReadWorkerPerCore
 }
 
+// SetBatchSize sets the size of the sequence batches.
+//
+// n - an integer representing the size of the sequence batches.
 func SetBatchSize(n int) {
 	_BatchSize = n
 }
 
+// InputQualityShift returns the quality shift value for input.
+//
+// It can be set programmatically by the SetInputQualityShift() function.
+// This value is used to decode the quality scores in FASTQ files.
+// The quality shift value defaults to 33, which is the correct value for
+// Sanger formated FASTQ files.
+// The quality shift value can be modified to 64 by the command line option
+// --solexa, for decoding old Solexa formated FASTQ files.
+//
+// No parameters.
+// Returns an integer representing the quality shift value for input.
 func InputQualityShift() int {
 	return _Quality_Shift_Input
 }
 
+// OutputQualityShift returns the quality shift value used for FASTQ output.
+//
+// No parameters.
+// Returns an integer representing the quality shift value for output.
 func OutputQualityShift() int {
 	return _Quality_Shift_Output
 }
 
+// SetInputQualityShift sets the quality shift value for decoding FASTQ.
+//
+// n - an integer representing the quality shift value to be set.
 func SetInputQualityShift(n int) {
 	_Quality_Shift_Input = n
 }
 
+// SetOutputQualityShift sets the quality shift value used for FASTQ output.
+//
+// n - an integer representing the quality shift value to be set.
 func SetOutputQualityShift(n int) {
 	_Quality_Shift_Output = n
 }
+
+// SetMaxCPU sets the maximum number of CPU cores allowed.
+//
+// n - an integer representing the new maximum number of CPU cores.
+func SetMaxCPU(n int) {
+	_MaxAllowedCPU = n
+}
+
+// SetReadWorker sets the number of workers for reading files.
+//
+// The number of worker dedicated to reading files is determined
+// as the number of allowed CPU cores multiplied by number of read workers per core.
+// Setting the number of read workers using this function allows to decouple the number
+// of read workers from the number of CPU cores.
+//
+// n - an integer representing the number of workers to be set.
+func SetStrictReadWorker(n int) {
+	_StrictReadWorker = n
+}
+
+// ReadWorker returns the number of workers for reading files.
+//
+// No parameters.
+// Returns an integer representing the number of workers.
+func StrictReadWorker() int {
+	return _StrictReadWorker
+}
+
+// ParallelFilesRead returns the number of files to be read in parallel.
+//
+// No parameters.
+// Returns an integer representing the number of files to be read.
+func ParallelFilesRead() int {
+	if _ParallelFilesRead == 0 {
+		return CLIParallelWorkers()
+	} else {
+		return _ParallelFilesRead
+	}
+}
+
+// SetParallelFilesRead sets the number of files to be read in parallel.
+//
+// n - an integer representing the number of files to be set.
+func SetParallelFilesRead(n int) {
+	_ParallelFilesRead = n
+}

pkg/obiseq/language.go

@@ -2,10 +2,11 @@ package obiseq
 
 import (
 	"fmt"
-	"log"
 	"reflect"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 	"github.com/PaesslerAG/gval"
 )
@@ -38,8 +39,6 @@ import (
 // 	return float64(m)
 // }
 
-
-
 // 	return float64(m)
 // }
 

pkg/obiseq/pool.go

@@ -1,9 +1,10 @@
 package obiseq
 
 import (
-	"log"
 	"sync"
 
+	log "github.com/sirupsen/logrus"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 )
 

pkg/obitools/obiconvert/sequence_reader.go

@@ -136,7 +136,7 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 			nreader := 1
 
 			if CLINoInputOrder() {
-				nreader = obioptions.CLIParallelWorkers()
+				nreader = obioptions.ParallelFilesRead()
 			}
 
 			iterator = obiformats.ReadSequencesBatchFromFiles(

pkg/obitools/obicsv/obicsv.go

@@ -1,7 +1,7 @@
 package obicsv
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"

pkg/obitools/obigrep/grep.go

@@ -1,7 +1,7 @@
 package obigrep
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"

pkg/obitools/obipcr/pcr.go

@@ -60,5 +60,5 @@ func CLIPCR(iterator obiiter.IBioSequence) (obiiter.IBioSequence, error) {
 		iterator = iterator.Pipe(frags)
 	}
 
-	return iterator.MakeISliceWorker(worker, false, obioptions.CLIParallelWorkers()), nil
+	return iterator.LimitMemory(0.5).MakeISliceWorker(worker, false, obioptions.CLIParallelWorkers()), nil
 }

pkg/obitools/obirefidx/geomindexing.go

@@ -2,7 +2,7 @@ package obirefidx
 
 import (
 	"fmt"
-	"log"
+	log "github.com/sirupsen/logrus"
 	"sort"
 	"sync"
 

pkg/obitools/obirefidx/obirefidx.go

@@ -221,5 +221,5 @@ func IndexReferenceDB(iterator obiiter.IBioSequence) obiiter.IBioSequence {
 		go f()
 	}
 
-	return indexed.Rebatch(1000)
+	return indexed.Rebatch(obioptions.CLIBatchSize())
 }

pkg/obitools/obiscript/options.go

@@ -1,7 +1,8 @@
 package obiscript
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
+
 	"os"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"

pkg/obitools/obisplit/options.go

@@ -3,7 +3,7 @@ package obisplit
 import (
 	"encoding/csv"
 	"fmt"
-	"log"
+	log "github.com/sirupsen/logrus"
 	"os"
 	"slices"
 

pkg/obitools/obitag/options.go

@@ -1,7 +1,7 @@
 package obitag
 
 import (
-	"log"
+	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"

pkg/obiutils/cast_interface.go

@@ -2,8 +2,9 @@ package obiutils
 
 import (
 	"fmt"
-	"log"
 	"reflect"
+
+	log "github.com/sirupsen/logrus"
 )
 
 // InterfaceToString converts an interface value to a string.