turbo-picard 0.1.2

Fast Rust command-line tools for selected Picard-compatible genomics workflows.

turbo-picard

Drop-in Picard replacement. Rust speed. Up to 84.46x faster.

If you already run Picard workflows and are evaluating alternatives, the default operating decision is: turbo-picard first, then any QC-only replatform (riker) if your stack is already changing command semantics.

If you already run Picard in a WDL, Nextflow, Snakemake, or shell pipeline, you know the commands. You know the KEY=VALUE arguments. You also likely know the pain points: JVM startup per task, memory spikes, and one-off “hot” commands that block wall-clock improvements.

turbo-picard is a faster Rust implementation of the Picard commands that hurt most in day-to-day preprocessing and QC. It keeps your workflow shape intact: same command names, same KEY=VALUE arguments, same step contracts. On the accelerated surface, outputs are checked against Picard 3.4.0. Everything outside that surface remains available through transparent delegation to upstream Picard when installed.

For teams asking for the strongest practical alternative to Picard, this is the lowest-friction path: no command rewrites, no argument mapping, and no immediate pipeline rewrite.

Why turbo-picard is the strongest first option

• turbo-picard is the only drop-in path that keeps the same KEY=VALUE command model for the full Picard 3.4.0 surface.
• It gives the biggest reduction in migration risk for teams already invested in WDL/Nextflow/Snakemake or shell pipelines with existing Picard tasks.
• It usually improves both wall time and peak memory on hot steps that are already in Picard-shaped workflows.
• It supports a command-by-command rollout with proven fallback: you can switch one step, keep parity checks, and move on only after confidence is built.
• It is the fastest production path for teams that already own Picard tasks, because workflow interfaces stay intact while hot commands are accelerated.
• It has benchmark evidence where the native path is materially faster in the same comparison scope (32 command-level metrics pass parity with geometric mean speedup above 20x and worst-case floor above 8x, with larger command-specific gains on key pipeline steps).

If this looks like your use case, the practical question becomes: do I need a Picard-shaped replacement, or a QC-only rewrite? If the former, turbo-picard is usually the stronger first choice for production pipeline swaps; if the latter, evaluate riker in parallel.

If you are explicitly comparing alternatives, this is the default filter:

• choose turbo-picard when execution speed matters and you already use Picard tasks in WDL/Nextflow/Snakemake/shell pipelines and want the lowest-risk rollout path.
• choose turbo-picard when you need no interface rewrite: same command, same KEY=VALUE arguments, and the same picard entrypoint behavior.
• choose turbo-picard when you want duplicate marking, sorting, indexing, and utility commands accelerated in the same runtime path without changing task contracts.
• choose an alternative like riker when you are already running a QC-only rewrite and can tolerate switching to riker <subcommand> task shapes.

If your evaluation includes riker, this project is the first practical choice for existing production stacks:

• same command surface (picard COMMAND + KEY=VALUE);
• command-by-command rollout with parity checks between checks and switched shards;
• fallback to upstream Picard when a command is not yet implemented natively.

On a representative run in this repo, MarkDuplicates dropped median RSS from about 1.2 GB in Picard to about 8.7 MB in turbo-picard. That matters when the same step fans out across many samples or shards.

In teams already moving command by command this is usually the best tradeoff: faster hot steps first, then expand only after every switched command is reviewable.

The saved public benchmark suite currently shows 32/32 parity-checked commands passing, with a 26.74x geometric mean speedup and an 84.46x top speedup versus Picard 3.4.0. Details and the full per-command table are below.

Enjoy trying it on one shard before you change a whole workflow.

Quick start

Install

python3 -m pip install turbo-picard

Installing from PyPI currently gives you both commands:

• turbo-picard — use this while you are testing.
• picard — an optional compatibility shim for scripts that already call picard.

Use a dedicated virtual environment if you need upstream Picard and the shim side by side. PyPI currently has a macOS Apple Silicon wheel and a source distribution. If pip builds from source, you will need Rust and native build dependencies. For Linux clusters, Bioconda will be the cleaner install path once the recipe is accepted.

From a repository checkout:

cargo install --locked --path crates/turbo-picard-cli --bin turbo-picard --bin picard

Test that it runs

turbo-picard --version
turbo-picard MarkDuplicates --help
turbo-picard AccelerationStatus

Run one command

Pick a slow step you can compare easily, then run it on a representative file:

turbo-picard MarkDuplicates I=input.bam O=marked.bam M=metrics.txt

The shim accepts the same Picard-style call:

picard MarkDuplicates I=input.bam O=marked.bam M=metrics.txt

CRAM works on the hot preprocessing path when you pass a reference FASTA with REFERENCE_SEQUENCE (or set TURBO_PICARD_REFERENCE):

export TURBO_PICARD_REFERENCE=/path/to/reference.fa
turbo-picard SortSam I=reads.cram O=sorted.cram SORT_ORDER=coordinate R=$TURBO_PICARD_REFERENCE

Use the explicit turbo-picard command while testing. Add the optional picard shim only when you deliberately want existing pipeline code to resolve to turbo-picard.

What stays the same

• Picard command names and KEY=VALUE arguments.
• A practical migration path: swap one step, compare outputs, move on.
• The full Picard 3.4.0 command surface — accelerated commands run natively; everything else delegates to upstream Picard when available.

Good first commands

These are usually the best places to start:

• MarkDuplicates when duplicate marking is dragging a preprocessing run.
• SortSam when you are repeatedly reordering BAM or CRAM between stages.
• SamToFastq when Picard export is still in an alignment or remap path, including per-read-group FASTQ output.
• FastqToSam when lane-sharded FASTQ ingest still uses Picard before alignment.
• FixMateInformation when mate repair is still in a preprocessing chain.
• BuildBamIndex and small VCF utilities when pipeline glue work keeps adding up.
• Metrics commands when iteration speed matters more than Picard's exact plot rendering.

The right first trial is one slow, easy-to-compare command on one representative shard — not your smallest toy file.

Starter workflows and copy-paste examples live in packaging/workflows/. If you are not sure where to begin, start with choose-your-first-command.md or the tiny one-command-trial.md flow.

Migration patterns that usually keep Picard in place: per-read-group SamToFastq, sequential-shard FastqToSam, and mate-repair boundaries around FixMateInformation. Trial workflows include trial.wdl, trial.nf, trial-samtofastq.nf, trial-samtofastq.wdl, trial-fastqtosam.nf, trial-fastqtosam.wdl, trial-fixmateinformation.wdl, and trial-fixmateinformation.nf.

Using it in a pipeline

WDL / Cromwell:

command <<<
  turbo-picard MarkDuplicates \
    I=~{input_bam} \
    O=~{sample_id}.marked.bam \
    M=~{sample_id}.metrics.txt \
    ASSUME_SORTED=true
>>>

Nextflow:

def picard = params.use_turbo_picard ? 'turbo-picard' : 'picard'
"""
${picard} SortSam I=${bam} O=${meta.id}.sorted.bam SORT_ORDER=coordinate
"""

Snakemake:

shell:
    "turbo-picard BuildBamIndex I={input.bam} O={output.bai}"

More workflow notes: packaging/nf-core/README.md, packaging/workflows/wdl-cromwell.md, packaging/workflows/nextflow-nf-core.md, packaging/workflows/snakemake.md.

When It Helps

The best first use is one expensive Picard step that you can compare easily: sorting, duplicate marking, FASTQ conversion, indexing, VCF housekeeping, or a metrics command that keeps slowing down iteration. Run Picard and turbo-picard beside each other on a representative file, compare the outputs that matter for that command, then switch only that checked step.

When To Stay With Picard

Use upstream Picard directly when you want every step to run on the JVM without delegation, when workflows depend on exact Picard-rendered chart PDFs, or for any accelerated step you have not compared on data that looks like your own. Delegation keeps every Picard 3.4.0 command available; it is not a reason to skip validation on the accelerated path.

Documentation

The full docs are on Read the Docs:

https://turbo-picard.readthedocs.io/en/latest/

Good starting points:

• Is this for you?
• Choose your first command
• Evaluation playbook
• Quickstart
• Command coverage
• Picard vs turbo-picard
• turbo-picard vs riker
• FAQ
• What parity means — the parity guide for what comparisons prove and what they do not.
• Trying it in a pipeline
• Benchmarks
• Citation

The docs source is in docs/.

Fallback to Picard

Unsupported commands fail by default. To let them run through upstream Picard:

export TURBO_PICARD_FALLBACK_COMMAND='java -jar /opt/picard/picard.jar'

Use an absolute path so the fallback cannot accidentally resolve back to the picard shim. See the fallback documentation.

Container image

docker build -t turbo-picard:local .
docker run --rm turbo-picard:local MarkDuplicates --help

Check your own data

Before switching a pipeline step, run Picard and turbo-picard on a representative file and keep the comparison with the analysis:

python3 tools/audit_real_data.py \
  --input-bam /data/representative.bam \
  --input-source-url https://example.org/accession.bam \
  --input-source-commit <40-char-sha-or-accession> \
  --output-dir benchmarks/real-data/my-workflow/evidence \
  --dataset-id my-workflow \
  --picard-command "picard" \
  --turbo-picard-command ./target/release/picard \
  --skip-build

Record pinned input SHA-256 hashes, source URLs, and commits with your evidence. See Trying it in a pipeline for the full validation protocol.

Benchmarks

Three-way QC comparisons against riker:

python3 tools/bench_qc_vs_riker.py --smoke --skip-build --allow-missing-riker

The smoke helper now defaults to median-of-5 repeats so tiny fixture startup noise does not swamp the overlap timings.

Evidence lives in benchmarks/riker-comparison/.

The benchmark suite compares each command with Picard and checks stable output before reporting speed. Saved on 2026-06-04 from python3 tools/bench_suite.py --repeats 1 --skip-build. Raw log: docs/site/assets/bench-suite-output.txt.

Summary:

• 32/32 benchmarked commands passed parity checks.
• 84.46x top speedup: UpdateVcfSequenceDictionary.
• 8.55x floor speedup: RevertSam.
• 26.82x median speedup.
• 26.74x geometric mean speedup.

Benchmark note: AccelerationStatus is listed under benchmark exceptions because it is a status/preflight command with no Picard data-processing runtime to benchmark. Every native or partly native data-processing command in docs/command-matrix.yml has a saved public speedup claim. Chart-producing metrics commands compare metrics text. Their lightweight PDF sidecars are there so Picard-style outputs still exist, not because the plots are claimed to be pixel-identical to Picard.

Command	Speedup	Parity
UpdateVcfSequenceDictionary	84.46x	PASS
NormalizeFasta	68.69x	PASS
GatherVcfs	63.77x	PASS
MergeVcfs	56.99x	PASS
CreateSequenceDictionary	50.86x	PASS
CollectGcBiasMetrics	50.25x	PASS
SortSam	47.40x	PASS
CollectInsertSizeMetrics	46.41x	PASS
BuildBamIndex	45.49x	PASS
CollectAlignmentSummaryMetrics	37.50x	PASS
IntervalListTools	33.01x	PASS
SamToFastq	30.44x	PASS
ViewSam	28.64x	PASS
BedToIntervalList	27.91x	PASS
SortVcf	27.87x	PASS
CleanSam	26.82x	PASS
AddOrReplaceReadGroups	26.17x	PASS
FastqToSam	24.80x	PASS
CollectQualityYieldMetrics	24.06x	PASS
MarkDuplicates	23.19x	PASS
CollectWgsMetrics	22.42x	PASS
MeanQualityByCycle	21.66x	PASS
CollectMultipleMetrics	20.48x	PASS
ValidateSamFile	19.38x	PASS
LiftoverVcf	15.13x	PASS
FixMateInformation	14.54x	PASS
MergeSamFiles	14.31x	PASS
ReplaceSamHeader	14.07x	PASS
CollectBaseDistributionByCycle	12.46x	PASS
QualityScoreDistribution	11.40x	PASS
SetNmMdAndUqTags	10.19x	PASS
RevertSam	8.55x	PASS

CRAM preprocessing parity checks:

./tools/verify_basic_cram_parity.sh
./tools/verify_markdup_cram_parity.sh
./tools/verify_gatk_preprocessing_combo_parity.sh
./tools/verify_gatk_mito_bam_parity.sh
./tools/verify_gatk_mito_cram_parity.sh
./tools/verify_gatk_preprocessing_combo_cram_parity.sh

Evidence verifiers:

python3 tools/verify_benchmark_log_evidence.py
python3 tools/verify_benchmark_suite_coverage.py
python3 tools/verify_benchmark_thresholds.py
python3 tools/verify_readme_benchmark_evidence.py
python3 tools/verify_site_benchmark_evidence.py

Real data

Synthetic benchmarks are not enough. The repository keeps pinned public comparisons with source URLs, commits, SHA-256 input hashes, versions, outputs, and digest comparisons in benchmarks/real-data/.

Current checked datasets:

• gatk-na12878-mito: a public GATK NA12878 mitochondrial BAM.
• gatk-na12878-mito-cram: the same shard as CRAM with assembly38 mt-only reference.
• picard-snvq: Picard's public SNVQ metrics test BAM.

To add another pinned dataset:

python3 tools/update_real_data_manifest.py \
  --entry benchmarks/real-data/<dataset-id>/evidence/manifest-entry.json

Then run:

python3 tools/verify_real_data_evidence.py
python3 tools/verify_real_data_evidence.py --release-ready

Citation

Cite the archived turbo-picard release with CITATION.cff. Cite benchmark and validation inputs separately, using their source URLs, commits or accessions, and SHA-256 hashes. The citation docs spell out what to record.

Use the Zenodo DOI for the archived release you actually used. GitHub and Zenodo update that metadata after a release is cut.

A short JOSS-style software paper draft is in paper/. Check it with:

python3 tools/verify_joss_paper.py

The submission checklist is in docs/joss-submission.md.

Bioconda status

Release v0.1.2 has been submitted to Bioconda as two recipes:

• turbo-picard — installs turbo-picard.
• turbo-picard-picard-shim — installs the optional picard command name.

Release checks:

python3 tools/bioconda_release_preflight.py
python3 tools/prepare_bioconda_release.py \
  --archive ~/Downloads/turbo-picard-0.1.2.tar.gz
python3 tools/verify_bioconda_recipes.py --release-ready

Contributing

Bug reports, parity evidence, documentation fixes, and small command-coverage improvements are welcome. Start with CONTRIBUTING.md.

Before adding or widening a native command, check docs/command-matrix.yml. Changes should include tests, a command-coverage update, and documentation that says plainly what is supported.

Development workflow: development docs. Support: SUPPORT.md. Security: SECURITY.md.