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Parallel random access to gzip files

Project description

Rapidgzip: Parallelized Decompression of Gzip Files with Support for Fast Random Access

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This repository contains the command line tool rapidgzip, which can be used for parallel decompression of almost any gzip file. Other tools, such as bgzip, can only parallelize decompression of gzip files produced by themselves. rapidgzip works with all files, especially those produced by the usually installed GNU gzip. How this works can be read in the pugz paper or in the rapidgzip paper, which builds upon the former.

The Python module provides a RapidgzipFile class, which can be used to seek inside gzip files without having to decompress them first. Alternatively, you can use this simply as a parallelized gzip decoder as a replacement for Python's builtin gzip module in order to fully utilize all your cores.

The random seeking support is the same as provided by indexed_gzip but further speedups are realized at the cost of higher memory usage thanks to a least-recently-used cache in combination with a parallelized prefetcher.

This repository is a light-weight fork of the indexed_bzip2 repository, in which the main development takes place. This repository was created for visibility reasons and in order to keep indexed_bzip2 and rapidgzip releases separate. It will be updated at least for each release. Issues regarding rapidgzip should be opened here.

Table of Contents

  1. Installation
  2. Performance
    1. Scaling Benchmarks on 2xAMD EPYC CPU 7702 (2x64 cores)
      1. Decompression of Silesia Corpus
      2. Decompression Gzip-Compressed Base64 Data
    2. Scaling Benchmarks on Ryzen 3900X
      1. Decompression with Existing Index
      2. Decompression from Scratch
  3. Usage
    1. Command Line Tool
    2. Python Library
    3. Via Ratarmount
    4. C++ Library
  4. Citation
  5. About
  6. Internal Architecture
  7. Tracing the Decoder

Installation

You can simply install it from PyPI:

python3 -m pip install --upgrade pip  # Recommended for newer manylinux wheels
python3 -m pip install rapidgzip
rapidgzip --help
Advanced Installations

The latest unreleased development version can be tested out with:

python3 -m pip install --force-reinstall 'git+https://github.com/mxmlnkn/indexed_bzip2.git@master#egginfo=rapidgzip&subdirectory=python/rapidgzip'

And to build locally, you can use build and install the wheel:

cd python/rapidgzip
rm -rf dist
python3 -m build .
python3 -m pip install --force-reinstall --user dist/*.whl

Performance

Following are benchmarks showing the decompression bandwidth over the number of used cores.

There are two rapidgzip variants shown: (index) and (no index). Rapidgzip is generally faster when given an index with --import-index because it can delegate the decompression to ISA-l or zlib while it has to use its own custom-written gzip decompression engine when no index exists yet. Furthermore, decompression can be parallelized more evenly and more effectively when an index exists because the serializing window propagation step is not necessary.

The violin plots show 20 repeated measurements as a single "blob". Thin blobs signal very reproducible timings while thick blobs signal a large variance.

Scaling Benchmarks on 2xAMD EPYC CPU 7702 (2x64 cores)

Decompression of Silesia Corpus

This benchmark uses the Silesia corpus compressed as a .tar.gz file to show the decompression performance. However, the compressed dataset is only ~69 MB, which is not sufficiently large to show parallelization over 128 cores. That's why the TAR file is repeated as often as there are number of cores in the benchmark times 2 and then compressed into a single large gzip file, which is ~18 GB compressed and 54 GB uncompressed for 128 cores.

Rapidgzip achieves up to 24 GB/s with an index and 12 GB/s without.

Pugz is not shown as comparison because it is not able to decompress the Silesia dataset because it contains binary data, which it cannot handle.

Decompression of Gzip-Compressed Base64 Data

This benchmarks uses random data, that has been base64 encoded and then gzip-compressed. This is the next best case for rapidgzip after the trivial case of purely random data, which cannot be compressed and therefore can be decompressed with a simple memory copy. This next best case results in mostly Huffman-coding compressed data with only very few LZ77 back-references. Without LZ77 back-references, parallel decompression can be done more independently and therefore faster than in the case of many LZ77 back-references.

Decompression of Gzip-Compressed FASTQ Data

This benchmarks uses gzip-compressed FASTQ data. That's why the TAR file is repeated as often as there are number of cores in the benchmark to hold the decompression times roughly constant in order to make the benchmark over this large a range feasible. This is almost the worst case for rapidgzip because it contains many LZ77 back-references over very long ranges. This means that a fallback to ISA-L is not possible and it means that the costly two-staged decoding has to be done for almost all the data. This is also the reason why if fails to scale above 64 cores, i.e, to teh second CPU socket. The first and second decompression stages are completely independently submitted to a thread pool, which on this NUMA architecture means, that data needs to be costly transferred from one processor socket to the other if the second step for a chunk is not done on the same processor as the first. This should be fixable by making the ThreadPool NUMA-aware.

These three scaling plots were created with rapidgzip 0.9.0 while the ones in the paper were created with 0.5.0.

Scaling Benchmarks on Ryzen 3900X

These benchmarks on my local workstation with a Ryzen 3900X only has 12 cores (24 virtual cores) but the base frequency is much higher than the 2xAMD EPYC CPU 7702.

Decompression With Existing Index

4GiB-base64 4GiB-base64 20x-silesia 20x-silesia
Uncompressed Size 4 GiB 3.95 GiB
Compressed Size 3.04 GiB 1.27 GiB
Module Bandwidth
/ (MB/s)
Speedup Bandwidth
/ (MB/s)
Speedup
gzip 250 1 293 1
rapidgzip (0 threads) 5179 20.6 5640 18.8
rapidgzip (1 threads) 488 1.9 684 2.3
rapidgzip (2 threads) 902 3.6 1200 4.0
rapidgzip (6 threads) 2617 10.4 3250 10.9
rapidgzip (12 threads) 4463 17.7 5600 18.7
rapidgzip (24 threads) 5240 20.8 5750 19.2
rapidgzip (32 threads) 4929 19.6 5300 17.7

Decompression From Scratch

4GiB-base64 4GiB-base64 20x-silesia 20x-silesia
Uncompressed Size 4 GiB 3.95 GiB
Compressed Size 3.04 GiB 1.27 GiB
Module Bandwidth
/ (MB/s)
Speedup Bandwidth
/ (MB/s)
Speedup
gzip 250 1 293 1
rapidgzip (0 threads) 5060 20.1 2070 6.9
rapidgzip (1 threads) 487 1.9 630 2.1
rapidgzip (2 threads) 839 3.3 694 2.3
rapidgzip (6 threads) 2365 9.4 1740 5.8
rapidgzip (12 threads) 4116 16.4 1900 6.4
rapidgzip (24 threads) 4974 19.8 2040 6.8
rapidgzip (32 threads) 4612 18.3 2580 8.6

Usage

Command Line Tool

rapidgzip --help

# Parallel decoding: 1.7 s
time rapidgzip -d -c -P 0 sample.gz | wc -c

# Serial decoding: 22 s
time gzip -d -c sample.gz | wc -c

Python Library

Simple open, seek, read, and close

from rapidgzip import RapidgzipFile

file = RapidgzipFile("example.gz", parallelization=os.cpu_count())

# You can now use it like a normal file
file.seek(123)
data = file.read(100)
file.close()

The first call to seek will ensure that the block offset list is complete and therefore might create them first. Because of this the first call to seek might take a while.

Use with context manager

import os
import rapidgzip

with rapidgzip.open("example.gz", parallelization=os.cpu_count()) as file:
    file.seek(123)
    data = file.read(100)

Storing and loading the block offset map

The creation of the list of gzip blocks can take a while because it has to decode the gzip file completely. To avoid this setup when opening a gzip file, the block offset list can be exported and imported.

Open a pure Python file-like object for indexed reading

import io
import os
import rapidgzip as rapidgzip

with open("example.gz", "rb") as file:
    in_memory_file = io.BytesIO(file.read())

with rapidgzip.open(in_memory_file, parallelization=os.cpu_count()) as file:
    file.seek(123)
    data = file.read(100)

Via Ratarmount

rapidgzip is the default backend in ratarmount since version 0.14.0. Then, you can use ratarmount to mount single gzip files easily.

base64 /dev/urandom | head -c $(( 4 * 1024 * 1024 * 1024 )) | gzip > sample.gz
# Serial decoding: 23 s
time gzip -c -d sample.gz | wc -c

python3 -m pip install --user ratarmount
ratarmount sample.gz mounted

# Parallel decoding: 3.5 s
time cat mounted/sample | wc -c

# Random seeking to the middle of the file and reading 1 MiB: 0.287 s
time dd if=mounted/sample bs=$(( 1024 * 1024 )) \
       iflag=skip_bytes,count_bytes skip=$(( 2 * 1024 * 1024 * 1024 )) count=$(( 1024 * 1024 )) | wc -c

C++ library

Because it is written in C++, it can of course also be used as a C++ library. In order to make heavy use of templates and to simplify compiling with Python setuptools, it is mostly header-only so that integration it into another project should be easy. The license is also permissive enough for most use cases.

I currently did not yet test integrating it into other projects other than simply manually copying the source in src/core, src/rapidgzip, and if integrated zlib is desired also src/external/zlib. If you have suggestions and wishes like support with CMake or Conan, please open an issue.

Citation

A paper describing the implementation details and showing the scaling behavior with up to 128 cores has been submitted to and accepted in ACM HPDC'23, The 32nd International Symposium on High-Performance Parallel and Distributed Computing. The paper can be accessed freely on ACM DL. The accompanying presentation can be found here.

If you use this software for your scientific publication, please cite it as:

@inproceedings{rapidgzip,
    author    = {Knespel, Maximilian and Brunst, Holger},
    title     = {Rapidgzip: Parallel Decompression and Seeking in Gzip Files Using Cache Prefetching},
    year      = {2023},
    isbn      = {9798400701559},
    publisher = {Association for Computing Machinery},
    address   = {New York, NY, USA},
    url       = {https://doi.org/10.1145/3588195.3592992},
    doi       = {10.1145/3588195.3592992},
    abstract  = {Gzip is a file compression format, which is ubiquitously used. Although a multitude of gzip implementations exist, only pugz can fully utilize current multi-core processor architectures for decompression. Yet, pugz cannot decompress arbitrary gzip files. It requires the decompressed stream to only contain byte values 9–126. In this work, we present a generalization of the parallelization scheme used by pugz that can be reliably applied to arbitrary gzip-compressed data without compromising performance. We show that the requirements on the file contents posed by pugz can be dropped by implementing an architecture based on a cache and a parallelized prefetcher. This architecture can safely handle faulty decompression results, which can appear when threads start decompressing in the middle of a gzip file by using trial and error. Using 128 cores, our implementation reaches 8.7 GB/s decompression bandwidth for gzip-compressed base64-encoded data, a speedup of 55 over the single-threaded GNU gzip, and 5.6 GB/s for the Silesia corpus, a speedup of 33 over GNU gzip.},
    booktitle = {Proceedings of the 32nd International Symposium on High-Performance Parallel and Distributed Computing},
    pages     = {295–307},
    numpages  = {13},
    keywords  = {gzip, decompression, parallel algorithm, performance, random access},
    location  = {Orlando, FL, USA},
    series    = {HPDC '23},
}

About

This tool originated as a backend for ratarmount. After writing the bzip2 backend for ratarmount, my hesitation about reimplementing custom decoders for existing file formats has vastly diminished. And, while random access to gzip files did exist with indexed_gzip, it did not support parallel decompression neither for the index creation nor when the index already exists. The latter of which is trivial, when ignoring load balancing issues, but parallelizing even the index creation is vastly more complicated because decompressing data requires the previous 32 KiB of decompressed data to be known.

After implementing a production-ready version by improving upon the algorithm used by pugz, I submitted a paper. The review process was double-blind and I was unsure whether to pseudonymize Pragzip because it has already been uploaded to Github. In the end, I used "rapidgzip" during the review process and because I was not sure, which form fields should be filled with the pseudonymized title, I simply stuck with it. Rapidgzip was chosen for similar reason to pragzip, namely the P and RA are acronyms for Parallel and Random Access. As rapgzip, did not stick, I used rapidgzip, which now also contains the foremost design goal in its name: being rapidly faster than single-threaded implementations. Furthermore, the additional ID could be interpreted to stand for Index and Decompression, making "rapid" a partial backronym.

Internal Architecture

The main part of the internal architecture used for parallelizing is the same as used for indexed_bzip2.

Tracing the Decoder

Performance profiling and tracing is done with Score-P for instrumentation and Vampir for visualization. This is one way, you could install Score-P with most of the functionalities on Ubuntu 22.04.

Installation of Dependencies

Installation steps for Score-P
sudo apt-get install libopenmpi-dev openmpi-bin gcc-11-plugin-dev llvm-dev libclang-dev libunwind-dev \
                     libopen-trace-format-dev otf-trace libpapi-dev

# Install Score-P (to /opt/scorep)
SCOREP_VERSION=8.0
wget "https://perftools.pages.jsc.fz-juelich.de/cicd/scorep/tags/scorep-${SCOREP_VERSION}/scorep-${SCOREP_VERSION}.tar.gz"
tar -xf "scorep-${SCOREP_VERSION}.tar.gz"
cd "scorep-${SCOREP_VERSION}"
./configure --with-mpi=openmpi --enable-shared --without-llvm --without-shmem --without-cubelib --prefix="/opt/scorep-${SCOREP_VERSION}"
make -j $( nproc )
make install

# Add /opt/scorep to your path variables on shell start
cat <<EOF >> ~/.bashrc
if test -d /opt/scorep; then
    export SCOREP_ROOT=/opt/scorep
    export PATH=$SCOREP_ROOT/bin:$PATH
    export LD_LIBRARY_PATH=$SCOREP_ROOT/lib:$LD_LIBRARY_PATH
fi
EOF

echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid

# Check whether it works
scorep --version
scorep-info config-summary

Tracing

Results for a version from 2023-02-04

Comparison without and with rpmalloc preloaded

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Uploaded CPython 3.7m musllinux: musl 1.1+ i686

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Uploaded CPython 3.7m manylinux: glibc 2.28+ x86-64

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Uploaded CPython 3.7m manylinux: glibc 2.17+ x86-64

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Uploaded CPython 3.7m manylinux: glibc 2.17+ i686

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Uploaded CPython 3.7m macOS 10.14+ x86-64

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Uploaded CPython 3.6m Windows x86-64

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Uploaded CPython 3.6m musllinux: musl 1.1+ x86-64

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Uploaded CPython 3.6m musllinux: musl 1.1+ i686

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Uploaded CPython 3.6m manylinux: glibc 2.28+ x86-64

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Uploaded CPython 3.6m manylinux: glibc 2.17+ x86-64

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Uploaded CPython 3.6m manylinux: glibc 2.17+ i686

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Uploaded CPython 3.6m macOS 10.14+ x86-64

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