The esa-matchfinder

The esa-matchfinder is a C99 library for efficient Lempel-Ziv factorization using enhanced suffix array (ESA).

Copyright (c) 2022-2023 Ilya Grebnov [email protected]

• The esa-matchfinder is block based algorithm with maximum supported block size of 512 megabytes finding matches in range of 2..64 bytes using 12x bytes of extra memory. ESA_MATCHFINDER_MATCH_BITS definition could be changed to support larger match finding range, but with reduction in maximum supported block size.
• The esa-matchfinder does not employ any heuristics or search depth limitations and always finds distance optimal matches even on highly repetitive sources. The only exception is matches at beginning at the block; due to implementation details the esa-matchfinder can not find any matches with offset 0.
• The esa-matchfinder is fast in best, average and worst cases (see Benchmarks below). But the esa-matchfinder is sensitive to fast memory and software prefetching and might not be suitable for some CPU architectures. The esa-matchfinder might also be suboptimal on specific data types (some DNA sequences in particular), so please benchmark yourself.
• The esa-matchfinder works with compilers from Microsoft and GNU, but I recommend Clang for best performance. Additionally, the esa-matchfinder is designed for 64-bit systems and will work suboptimally on 32-bit system.

Algorithm

The esa-matchfinder uses methodology of bottom-up traversal of the Longest Common Prefix (LCP) interval tree written in 2014-2015 by Eric Biggers [email protected] and dedicated to the public domain worldwide.

The esa-matchfinder finds all distance optimal matches (between min_match_length and max_match_length inclusive) for every position of the input block using following algorithm:

1. Suffix (SA) and longest common prefix (LCP) arrays are constructed for the input block. Next, interval tree is constructed on top of SA and LCP arrays.

• The data structure consisting of SA and LCP is often referred as enhanced suffix array (ESA). Hence the name of the match finder.

2. Each interval is a maximum range (could not be further extended to the left or right) of suffixes in SA with common prefix of certain length (LCP). This intervals represent internal nodes of suffix tree.
3. Using interval tree we can now traverse up or down to either wider interval with smaller common prefix or narrower intervals with larger common prefixes.
4. For purpose of Lempel-Ziv factorization we only need to support bottom-up traversal, so during interval tree construction we only need to capture link to parent interval and length of interval's common prefix.
5. LCP array is also pruned by min_match_length and max_match_length to reduce size and depth of interval tree.
6. Additionally, for each position of input block we capture link to a leaf interval corresponding to that position, so we can start bottom-up traversal during factorization phase.
7. SA, LCP and interval tree construction is done during input block parsing phase in linear time with optional multi-threaded optimization using OpenMP.
8. LZ factorization phase is done from left to right by bottom-up traversal of interval tree for each position from input block by reading and updating each corresponding interval with latest offset.

License

The esa-matchfinder released under the Apache License Version 2.0 and is considered suitable for production use. However, no warranty or fitness for a particular purpose is expressed or implied.

Changes

• December 2, 2023 (1.2.0)
  • Small performance optimization for esa_matchfinder_advance API.
• November 30, 2023 (1.1.0)
  • New API to find matches within specified sliding window.
• June 19, 2022 (1.0.1)
  • Improved cache coherence for ARMv8 architecture.
• June 12, 2022 (1.0.0)
  • Initial public release of the esa-matchfinder.

Example of usage (See esa_matchfinder.h for complete APIs list)

#include "esa_matchfinder.h"

long long multi_pass_optimal_parse(const unsigned char * buffer, int size)
{
    long long total_matches = 0;

    void * mf = esa_matchfinder_create(size, /*min_match_length*/ 2, /*max_match_length*/ 64);
    if (mf != NULL && esa_matchfinder_parse(mf, buffer, size) == ESA_MATCHFINDER_NO_ERROR)
    {
        for (int pass = 0; pass < 2; pass += 1)
        {
            ESA_MATCHFINDER_MATCH matches[ESA_MATCHFINDER_MAX_MATCH_LENGTH];

            esa_matchfinder_rewind(mf, /*position*/ 0);

            for (int position = 0; position < size; position += 1)
            {
                total_matches += esa_matchfinder_find_all_matches(mf, matches) - matches;
            }
        }
    }

    esa_matchfinder_destroy(mf);

    return total_matches;
}

---

Benchmarks

Methodology

• Input files were capped at 510MB for tests on x86-64 architecture and 128MB for tests on ARMv8 architecture
• For all match finders maximum match length was set to 64 bytes (other parameters were not changed)
• Optimality is defined as percentage of optimal matches (longest possible length) found across all possible matches
• The timings are minimum of five runs measuring single-threaded performance in optimal parsing mode

Specification (x86-64 architecture)

• OS: Microsoft Windows 10 Pro 64-Bit
• CPU: Intel Core i7-9700K Processor (12M Cache, 5GHz)
• RAM: 2x8 GB dual-channel DDR4 (4133 MHz, 17-17-17-37)
• Compiler: Microsoft Visual C++ compiler v14.32
• Optimizations: /MD /DNDEBUG /O2 /GL /arch:AVX2

Silesia Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
dickens	10192446	0.715 sec (14.26 MB/s)	100.00%	3.632 sec (2.81 MB/s)	40.43%	2.880 sec (3.54 MB/s)	99.84%
mozilla	51220480	3.533 sec (14.50 MB/s)	100.00%	12.364 sec (4.14 MB/s)	55.98%	8.546 sec (5.99 MB/s)	80.08%
mr	9970564	0.865 sec (11.53 MB/s)	100.00%	1.680 sec (5.93 MB/s)	56.13%	1.688 sec (5.91 MB/s)	94.35%
nci	33553445	3.626 sec (9.25 MB/s)	100.00%	6.155 sec (5.45 MB/s)	16.25%	5.957 sec (5.63 MB/s)	61.62%
ooffice	6152192	0.324 sec (18.99 MB/s)	100.00%	1.120 sec (5.49 MB/s)	70.35%	0.780 sec (7.89 MB/s)	84.30%
osdb	10085684	0.599 sec (16.84 MB/s)	100.00%	2.191 sec (4.60 MB/s)	35.58%	1.716 sec (5.88 MB/s)	85.83%
reymont	6627202	0.478 sec (13.86 MB/s)	100.00%	1.644 sec (4.03 MB/s)	27.64%	1.586 sec (4.18 MB/s)	99.43%
samba	21606400	1.484 sec (14.56 MB/s)	100.00%	4.093 sec (5.28 MB/s)	63.92%	2.932 sec (7.37 MB/s)	85.49%
sao	7251944	0.405 sec (17.91 MB/s)	100.00%	1.345 sec (5.39 MB/s)	34.99%	0.997 sec (7.27 MB/s)	51.66%
webster	41458703	4.388 sec (9.45 MB/s)	100.00%	15.712 sec (2.64 MB/s)	38.14%	12.630 sec (3.28 MB/s)	95.90%
x-ray	8474240	0.412 sec (20.57 MB/s)	100.00%	1.751 sec (4.84 MB/s)	90.99%	1.081 sec (7.84 MB/s)	95.25%
xml	5345280	0.278 sec (19.23 MB/s)	100.00%	0.777 sec (6.88 MB/s)	57.68%	0.667 sec (8.01 MB/s)	98.50%

Large Canterbury Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
bible.txt	4047392	0.256 sec (15.81 MB/s)	100.00%	1.021 sec (3.96 MB/s)	50.12%	0.806 sec (5.02 MB/s)	99.83%
E.coli	4638690	0.327 sec (14.19 MB/s)	100.00%	0.817 sec (5.68 MB/s)	2.70%	1.603 sec (2.89 MB/s)	99.95%
world192.txt	2473400	0.138 sec (17.92 MB/s)	100.00%	0.525 sec (4.71 MB/s)	63.90%	0.363 sec (6.81 MB/s)	99.10%

Manzini Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
chr22.dna	34553758	4.651 sec (7.43 MB/s)	100.00%	6.019 sec (5.74 MB/s)	4.67%	18.142 sec (1.90 MB/s)	96.22%
etext99	105277340	12.065 sec (8.73 MB/s)	100.00%	46.457 sec (2.27 MB/s)	24.64%	46.607 sec (2.26 MB/s)	98.62%
gcc-3.0.tar	86630400	8.230 sec (10.53 MB/s)	100.00%	23.390 sec (3.70 MB/s)	59.21%	17.811 sec (4.86 MB/s)	94.33%
howto	39422105	3.259 sec (12.10 MB/s)	100.00%	14.254 sec (2.77 MB/s)	45.33%	10.613 sec (3.71 MB/s)	95.05%
jdk13c	69728899	6.522 sec (10.69 MB/s)	100.00%	11.797 sec (5.91 MB/s)	61.10%	10.246 sec (6.81 MB/s)	92.01%
linux-2.4.5.tar	116254720	11.075 sec (10.50 MB/s)	100.00%	36.868 sec (3.15 MB/s)	57.33%	27.014 sec (4.30 MB/s)	93.13%
rctail96	114711151	10.375 sec (11.06 MB/s)	100.00%	31.860 sec (3.60 MB/s)	54.54%	26.365 sec (4.35 MB/s)	98.46%
rfc	116421901	14.677 sec (7.93 MB/s)	100.00%	37.246 sec (3.13 MB/s)	35.41%	33.363 sec (3.49 MB/s)	87.53%
sprot34.dat	109617186	11.628 sec (9.43 MB/s)	100.00%	53.546 sec (2.05 MB/s)	59.60%	28.559 sec (3.84 MB/s)	93.73%
w3c2	104201579	9.480 sec (10.99 MB/s)	100.00%	19.914 sec (5.23 MB/s)	64.99%	15.080 sec (6.91 MB/s)	93.09%

Large Text Compression Benchmark Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
enwik8	100000000	10.241 sec (9.76 MB/s)	100.00%	48.950 sec (2.04 MB/s)	33.41%	40.285 sec (2.48 MB/s)	96.56%
enwik9	534773760	81.713 sec (6.54 MB/s)	100.00%	277.775 sec (1.93 MB/s)	24.76%	257.795 sec (2.07 MB/s)	91.65%

The Gauntlet Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
abac	200000	0.013 sec (15.38 MB/s)	100.00%	0.006 sec (33.33 MB/s)	100.00%	0.008 sec (25.00 MB/s)	100.00%
abba	10500596	1.045 sec (10.05 MB/s)	100.00%	2.926 sec (3.59 MB/s)	0.03%	2.789 sec (3.77 MB/s)	97.64%
book1x20	15375420	0.952 sec (16.15 MB/s)	100.00%	4.008 sec (3.84 MB/s)	30.82%	2.912 sec (5.28 MB/s)	99.87%
fib_s14930352	14930352	0.861 sec (17.34 MB/s)	100.00%	1.844 sec (8.10 MB/s)	96.99%	1.057 sec (14.13 MB/s)	100.00%
fss10	12078908	0.660 sec (18.30 MB/s)	100.00%	1.682 sec (7.18 MB/s)	95.65%	0.989 sec (12.21 MB/s)	100.00%
fss9	2851443	0.128 sec (22.28 MB/s)	100.00%	0.397 sec (7.18 MB/s)	95.65%	0.233 sec (12.24 MB/s)	100.00%
houston	3839141	0.257 sec (14.94 MB/s)	100.00%	0.141 sec (27.23 MB/s)	97.64%	0.173 sec (22.19 MB/s)	100.00%
paper5x80	956322	0.036 sec (26.56 MB/s)	100.00%	0.073 sec (13.10 MB/s)	94.59%	0.071 sec (13.47 MB/s)	99.94%
test1	2097152	0.080 sec (26.21 MB/s)	100.00%	0.070 sec (29.96 MB/s)	100.00%	0.101 sec (20.76 MB/s)	100.00%
test2	2097152	0.080 sec (26.21 MB/s)	100.00%	0.070 sec (29.96 MB/s)	100.00%	0.101 sec (20.76 MB/s)	100.00%
test3	2097088	0.077 sec (27.23 MB/s)	100.00%	0.071 sec (29.54 MB/s)	100.00%	0.086 sec (24.38 MB/s)	100.00%

Pizza & Chilli Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
dblp.xml	296135874	39.566 sec (7.48 MB/s)	100.00%	100.764 sec (2.94 MB/s)	46.52%	74.943 sec (3.95 MB/s)	93.38%
dna	403927746	98.964 sec (4.08 MB/s)	100.00%	72.058 sec (5.61 MB/s)	0.51%	314.605 sec (1.28 MB/s)	63.97%
english.1024MB	534773760	94.228 sec (5.68 MB/s)	100.00%	266.114 sec (2.01 MB/s)	15.29%	309.063 sec (1.73 MB/s)	95.59%
pitches	55832855	3.698 sec (15.10 MB/s)	100.00%	16.901 sec (3.30 MB/s)	79.95%	10.341 sec (5.40 MB/s)	95.11%
proteins	534773760	69.993 sec (7.64 MB/s)	100.00%	463.257 sec (1.15 MB/s)	43.66%	320.663 sec (1.67 MB/s)	99.85%
sources	210866607	22.116 sec (9.53 MB/s)	100.00%	73.429 sec (2.87 MB/s)	54.69%	56.835 sec (3.71 MB/s)	93.25%

Pizza & Chilli Repetitive Corpus (x86-64 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
cere	461286644	68.413 sec (6.74 MB/s)	100.00%	77.037 sec (5.99 MB/s)	7.30%	266.363 sec (1.73 MB/s)	94.04%
coreutils	205281778	18.967 sec (10.82 MB/s)	100.00%	54.280 sec (3.78 MB/s)	34.14%	40.171 sec (5.11 MB/s)	87.59%
einstein.de.txt	92758441	6.620 sec (14.01 MB/s)	100.00%	10.236 sec (9.06 MB/s)	80.28%	9.088 sec (10.21 MB/s)	96.82%
einstein.en.txt	467626544	39.117 sec (11.95 MB/s)	100.00%	56.046 sec (8.34 MB/s)	77.54%	48.619 sec (9.62 MB/s)	97.64%
Escherichia_Coli	112689515	16.191 sec (6.96 MB/s)	100.00%	19.889 sec (5.67 MB/s)	0.26%	63.204 sec (1.78 MB/s)	96.93%
influenza	154808555	44.042 sec (3.52 MB/s)	100.00%	25.125 sec (6.16 MB/s)	28.19%	27.703 sec (5.59 MB/s)	98.49%
kernel	257961616	21.931 sec (11.76 MB/s)	100.00%	81.326 sec (3.17 MB/s)	24.72%	59.968 sec (4.30 MB/s)	93.18%
para	429265758	69.888 sec (6.14 MB/s)	100.00%	73.130 sec (5.87 MB/s)	3.94%	251.836 sec (1.70 MB/s)	93.09%
world_leaders	46968181	5.758 sec (8.16 MB/s)	100.00%	6.124 sec (7.67 MB/s)	40.96%	6.126 sec (7.67 MB/s)	62.59%
dblp.xml.00001.1	104857600	12.065 sec (8.69 MB/s)	100.00%	18.851 sec (5.56 MB/s)	32.29%	16.655 sec (6.30 MB/s)	96.79%
dblp.xml.00001.2	104857600	12.765 sec (8.21 MB/s)	100.00%	18.972 sec (5.53 MB/s)	32.01%	16.767 sec (6.25 MB/s)	96.99%
dblp.xml.0001.1	104857600	13.064 sec (8.03 MB/s)	100.00%	18.952 sec (5.53 MB/s)	32.36%	16.712 sec (6.27 MB/s)	96.76%
dblp.xml.0001.2	104857600	15.651 sec (6.70 MB/s)	100.00%	19.258 sec (5.44 MB/s)	30.31%	17.409 sec (6.02 MB/s)	96.99%
dna.001.1	104857600	16.519 sec (6.35 MB/s)	100.00%	18.601 sec (5.64 MB/s)	0.23%	33.080 sec (3.17 MB/s)	99.49%
english.001.2	104857600	11.087 sec (9.46 MB/s)	100.00%	29.621 sec (3.54 MB/s)	36.64%	21.313 sec (4.92 MB/s)	99.32%
proteins.001.1	104857600	12.562 sec (8.35 MB/s)	100.00%	24.271 sec (4.32 MB/s)	89.70%	12.411 sec (8.45 MB/s)	99.99%
sources.001.2	104857600	10.484 sec (10.00 MB/s)	100.00%	20.817 sec (5.04 MB/s)	43.87%	16.775 sec (6.25 MB/s)	97.24%
fib41	267914296	19.852 sec (13.50 MB/s)	100.00%	33.175 sec (8.08 MB/s)	96.99%	19.070 sec (14.05 MB/s)	100.00%
rs.13	216747218	16.024 sec (13.53 MB/s)	100.00%	30.276 sec (7.16 MB/s)	95.65%	17.824 sec (12.16 MB/s)	100.00%
tm29	268435456	19.926 sec (13.47 MB/s)	100.00%	51.541 sec (5.21 MB/s)	89.58%	26.480 sec (10.14 MB/s)	100.00%

Specification (ARMv8 architecture)

• OS: Ubuntu 20.04 LTS 64-Bit
• CPU: ODROID-N2+ Amlogic S922X (Cortex-A73 2.4Ghz)
• RAM: 4GB LPDDR4 (2666 MHz)
• Compiler: Clang v10.0.0
• Optimizations: -DNDEBUG -O3 -flto=thin -mcpu=native

Silesia Corpus (ARMv8 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
dickens	10192446	4.595 sec (2.22 MB/s)	100.00%	18.955 sec (0.54 MB/s)	40.43%	9.678 sec (1.05 MB/s)	99.84%
mozilla	51220480	18.435 sec (2.78 MB/s)	100.00%	43.410 sec (1.18 MB/s)	55.98%	24.890 sec (2.06 MB/s)	80.08%
mr	9970564	4.070 sec (2.45 MB/s)	100.00%	7.299 sec (1.37 MB/s)	56.13%	5.935 sec (1.68 MB/s)	94.35%
nci	33553445	18.982 sec (1.77 MB/s)	100.00%	18.183 sec (1.85 MB/s)	16.25%	16.916 sec (1.98 MB/s)	61.62%
ooffice	6152192	1.884 sec (3.27 MB/s)	100.00%	5.239 sec (1.17 MB/s)	70.35%	2.779 sec (2.21 MB/s)	84.30%
osdb	10085684	4.090 sec (2.47 MB/s)	100.00%	9.079 sec (1.11 MB/s)	35.58%	5.522 sec (1.83 MB/s)	85.83%
reymont	6627202	3.094 sec (2.14 MB/s)	100.00%	6.582 sec (1.01 MB/s)	27.64%	5.023 sec (1.32 MB/s)	99.43%
samba	21606400	8.063 sec (2.68 MB/s)	100.00%	16.016 sec (1.35 MB/s)	63.92%	8.947 sec (2.42 MB/s)	85.49%
sao	7251944	2.553 sec (2.84 MB/s)	100.00%	6.461 sec (1.12 MB/s)	34.99%	3.753 sec (1.93 MB/s)	51.66%
webster	41458703	23.900 sec (1.73 MB/s)	100.00%	67.306 sec (0.62 MB/s)	38.14%	36.756 sec (1.13 MB/s)	95.90%
x-ray	8474240	2.221 sec (3.82 MB/s)	100.00%	7.558 sec (1.12 MB/s)	90.99%	3.921 sec (2.16 MB/s)	95.25%
xml	5345280	1.590 sec (3.36 MB/s)	100.00%	2.380 sec (2.25 MB/s)	57.68%	1.910 sec (2.80 MB/s)	98.50%

Large Canterbury Corpus (ARMv8 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
bible.txt	4047392	1.619 sec (2.50 MB/s)	100.00%	4.741 sec (0.85 MB/s)	50.12%	2.688 sec (1.51 MB/s)	99.83%
E.coli	4638690	2.068 sec (2.24 MB/s)	100.00%	1.988 sec (2.33 MB/s)	2.70%	5.537 sec (0.84 MB/s)	99.95%
world192.txt	2473400	0.914 sec (2.71 MB/s)	100.00%	2.583 sec (0.96 MB/s)	63.90%	1.243 sec (1.99 MB/s)	99.10%

Manzini Corpus (ARMv8 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
chr22.dna	34553758	24.388 sec (1.42 MB/s)	100.00%	14.290 sec (2.42 MB/s)	4.67%	54.272 sec (0.64 MB/s)	96.22%
etext99	105277340	66.408 sec (1.59 MB/s)	100.00%	216.948 sec (0.49 MB/s)	24.64%	133.282 sec (0.79 MB/s)	98.62%
gcc-3.0.tar	86630400	41.198 sec (2.10 MB/s)	100.00%	89.721 sec (0.97 MB/s)	59.21%	51.345 sec (1.69 MB/s)	94.33%
howto	39422105	18.222 sec (2.16 MB/s)	100.00%	61.739 sec (0.64 MB/s)	45.33%	31.992 sec (1.23 MB/s)	95.05%
jdk13c	69728899	32.194 sec (2.17 MB/s)	100.00%	39.770 sec (1.75 MB/s)	61.10%	30.121 sec (2.31 MB/s)	92.01%
linux-2.4.5.tar	116254720	55.748 sec (2.09 MB/s)	100.00%	135.994 sec (0.85 MB/s)	57.33%	75.110 sec (1.55 MB/s)	93.13%
rctail96	114711151	55.181 sec (2.08 MB/s)	100.00%	133.541 sec (0.86 MB/s)	54.54%	80.031 sec (1.43 MB/s)	98.46%
rfc	116421901	73.199 sec (1.59 MB/s)	100.00%	149.776 sec (0.78 MB/s)	35.41%	96.395 sec (1.21 MB/s)	87.53%
sprot34.dat	109617186	58.204 sec (1.88 MB/s)	100.00%	179.813 sec (0.61 MB/s)	59.60%	80.105 sec (1.37 MB/s)	93.73%
w3c2	104201579	49.571 sec (2.10 MB/s)	100.00%	70.244 sec (1.48 MB/s)	64.99%	45.104 sec (2.31 MB/s)	93.09%

Large Text Compression Benchmark Corpus (ARMv8 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
enwik8	100000000	53.981 sec (1.85 MB/s)	100.00%	206.851 sec (0.48 MB/s)	33.41%	112.780 sec (0.89 MB/s)	96.56%

The Gauntlet Corpus (ARMv8 architecture)

file	size	esa-matchfinder v1.0.0	optimality	LZMA HC4 v21.07	optimality	LZMA BT4 v21.07	optimality
abac	200000	0.045 sec (4.40 MB/s)	100.00%	0.023 sec (8.78 MB/s)	100.00%	0.046 sec (4.31 MB/s)	100.00%
abba	10500596	7.005 sec (1.50 MB/s)	100.00%	6.204 sec (1.69 MB/s)	0.03%	7.848 sec (1.34 MB/s)	97.64%
book1x20	15375420	6.223 sec (2.47 MB/s)	100.00%	25.273 sec (0.61 MB/s)	30.82%	12.392 sec (1.24 MB/s)	99.87%
fib_s14930352	14930352	3.682 sec (4.06 MB/s)	100.00%	6.112 sec (2.44 MB/s)	96.99%	4.503 sec (3.32 MB/s)	100.00%
fss10	12078908	3.123 sec (3.87 MB/s)	100.00%	5.428 sec (2.23 MB/s)	95.65%	3.771 sec (3.20 MB/s)	100.00%
fss9	2851443	0.757 sec (3.77 MB/s)	100.00%	1.277 sec (2.23 MB/s)	95.65%	0.891 sec (3.20 MB/s)	100.00%
houston	3839141	0.788 sec (4.87 MB/s)	100.00%	0.502 sec (7.65 MB/s)	97.64%	0.815 sec (4.71 MB/s)	100.00%
paper5x80	956322	0.179 sec (5.35 MB/s)	100.00%	0.192 sec (4.97 MB/s)	94.59%	0.217 sec (4.41 MB/s)	99.94%
test1	2097152	0.481 sec (4.36 MB/s)	100.00%	0.245 sec (8.55 MB/s)	100.00%	0.494 sec (4.24 MB/s)	100.00%
test2	2097152	0.479 sec (4.38 MB/s)	100.00%	0.246 sec (8.54 MB/s)	100.00%	0.494 sec (4.24 MB/s)	100.00%
test3	2097088	0.300 sec (6.98 MB/s)	100.00%	0.461 sec (4.55 MB/s)	100.00%	0.506 sec (4.15 MB/s)	100.00%