Programming Notes

Perl lexer development

dgroth — Fri, 27 Feb 2009 12:07:57 +0000

Our new project member, elchuxo, is currently working on a Perl lexer, called pplex. The program will allow to write flex like input files for scanner generation. Versions for the programming languages Tcl and Python will be released soon afterwards. The code for the Perl lexer is not yet released but is already in the CVS: http://bioscanners.cvs.sourceforge.net/viewvc/bioscanners/lexer/perl/. In the samples directory is already a wc implementation. Comments and suggestions are welcome.

Re2c sources for the BLASTScanner released

dgroth — Thu, 08 Jan 2009 09:31:26 +0000

Today the re2c sources for the BLASTScanner application has been released as well. You can use them to modifiy the BLASTScanner source code. The Zip-archiv contains a make file which should build on any computer architecture.

Direct download link src-release: BLASTScanner1.0-src.zip

Direct download link binary-release: BLASTScanner1.0.zip

BLASTScanner 1.0 released

dgroth — Tue, 23 Dec 2008 21:26:00 +0000

At the 23. of december 2008 the first offical release of BLASTScanner has been released. BLASTScanner is a small platform independent console application which translates BLAST-output of the NCBI-BLAST-tool into database code. No installation is required. Just download unpack and run. A single C-Source file is compiled into a very fast and very small application (~30kb). For instance a 20MB-BLAST-file can be translated in 2 seconds into database code suitable being piped into SQLite, MySQL or PostgreSQL-databases. You can download binaries for Win32, Linux32 and Linux64, Mac-OSX, OSF1 and Solaris as well as the C-code for compilation for your platform all together in a 79kb-Zip-file from the sourceforge project page: http://sourceforge.net/projects/bioscanners/

C# scanner generator tested

dgroth — Tue, 23 Dec 2008 18:15:06 +0000

There is the gplex scanner generator (http://plas.fit.qut.edu.au/gplex/) for the C#-programming language. Due to the mono runtime environment (http://www.mono-project.com/) C# code can be run on Win32, Linux and Mac-OSX platforms. As our wc sample run below suggests gplex scanner generated code is slower than Java JIT-compiled code but faster than Java-interpreted code. The mono application requires much less memory.

Tool/Queries	1	10	100	1000	10000
wc-flex	0.005	0.011	0.087	0.912	10.426
wc-java	0.197	0.248	0.367	1.549	14.707
wc-java016	0.216	0.263	0.346	1.533	14.806
wc-java064	0.209	0.243	0.364	1.522	14.649
wc-java512	0.216	0.247	0.351	1.542	16.486
wc-javaip	0.193	0.422	2.808	28.353	331.753
wc-mono1.2	0.168	0.282	1.580	15.650	175.863
wc-mono2.0	0.147	0.267	1.676	15.870	187.633
wc-mono2.0-static	0.150	0.272	1.670	16.265	189.411
wc-re2c	0.004	0.006	0.038	0.382	4.301
wc-unix	0.010	0.044	0.453	4.782	54.704

wc-mono-static means that a executable with the mono-runtime linked in was tested. Mono-frameworks were 1.2 and 2.0.1. Different options for java memory were tested. java016 means that java was run with the -Xmx16m option.

OboScanners for GeneOntology Files

dgroth — Fri, 14 Sep 2007 13:19:40 +0000

Mode/Lines	1	10	100	1000	10000	100000	250000	Memory (M
flex	0.001	0.001	0.001	0.004	0.015	0.182	0.313	2.
java15	0.132	0.135	0.132	0.242	0.623	1.273	2.130	79
java15_x64	0.137	0.133	0.133	0.233	0.581	1.240	2.288
java16	0.131	0.134	0.131	0.205	0.441	1.194	1.963	800
perl	0.031	0.031	0.031	0.032	0.066	0.384	0.961	7
plex2.0_32	0.001	0.001	0.002	0.011	0.109	1.011	2.765	0.8
plex2.2_32	0.001	0.001	0.003	0.012	0.123	1.136	3.136	1
plex2.2_64	0.002	0.001	0.003	0.016	0.155	1.479	3.808	1
tcl	0.090	0.089	0.092	0.123	0.439	3.392	8.724	6

Java-Memory Observations

dgroth — Fri, 14 Sep 2007 10:21:26 +0000

A problem with Java based applications is the hugh memory amount required to run the scanner. Tested were diffeent settings of the maximum memory allocation pool using the commandline option -Xmx.

Mode	1	10	100	1000	10000	Memory (Mb)
java	0.14	0.256	0.453	1.708	15.500	788
java -Xmx16m	0.174	0.260	0.436	1.728	15.598	290
java -Xmx32m	0.175	0.255	0.457	1.713	15.576	308
java -Xmx64m	0.175	0.254	0.456	1.713	15.460	339
java -Xmx128m	0.156	0.255	0.441	1.708	15.607	404
java -Xmx256	0.156	0.253	0.421	1.714	15.520	532
java -Xmx512	0.155	0.253	0.456	1.709	15.507	795

OboScanner

dgroth — Thu, 13 Sep 2007 13:10:30 +0000

Comparing 64 and 32bit Scanners generated with the tply-lexer for pascal (free pascal) and with the jflex-Lexer for Java. Java programs require about 800Mb of memory whereas the pascal programs require just 1Mb of memory. However the Java programs where faster with the complete gene ontology obofile (about 250000 lines).

Mode/Lines	1	10	100	1000	10000	100000	250000
obo-plex32	0.001	0.001	0.003	0.015	0.142	1.334	3.623
obo-plex64	0.001	0.001	0.003	0.015	0.160	1.448	4.038
obo-java15_x64	0.140	0.135	0.133	0.206	0.623	1.297	2.241
obo-java15	0.133	0.136	0.137	0.208	0.596	1.352	2.028
obo-java16	0.134	0.132	0.134	0.215	0.465	1.117	1.943

WC-Comparisons

dgroth — Thu, 13 Sep 2007 06:43:55 +0000

Again the same set of blastfiles was used for testing of a word counting scanner. Flex and re2c based scanners again were performing best.

Mode	1	10	100	1000	10000
wc-flex	0.003	0.011	0.102	1.083	12.459
wc-flexpp	0.026	0.169	1.940	21.193	244.294
wc-gcj-exe	0.097	0.123	0.441	3.934	42.928
wc-gcj	0.087	0.307	2.875	30.163	nd
wc-java14	0.153	0.259	0.481	1.748	15.965
wc-java	0.176	0.257	0.444	1.704	15.682
wc-javaip14	0.122	0.345	2.774	28.982	329.265
wc-javaip	0.120	0.345	2.771	28.769	335.123
wc-perl-hand	0.006	0.018	0.155	1.590	18.132
wc-perl-lex	0.164	0.872	9.108	97.561	nd
wc-plex64	0.008	0.044	0.476	5.106	58.264
wc-plex	0.006	0.043	0.433	4.589	55.773
wc-re2c	0.002	0.005	0.035	0.346	3.975
wc-tcl8532	0.257	1.625	17.440	190.076	nd
wc-tcl8564	0.183	1.071	11.550	126.854	nd
wc-tcl	0.401	2.327	25.212	274.777	nd
wc-unix	0.006	0.026	0.285	2.937	33.792

BlastParsers vs BlastScanners

dgroth — Tue, 26 Jun 2007 10:22:56 +0000

We recently compared our newly generated Blast scanners with currently available BLAST-scanners from the BioJava-project [1], the BioPerl-project [2] and with the Zerg-BLAST parser [3]. Those parsers were compared with our scanners created either with C-based scanner generators like Re2c [4] and Flex [5] or with the Java based scanner generator Jflex [6]. Wheras the parsers mentioned above requires source code editing for parsing and analysing blast files our scanners are emitting SQL-code. Analyzing of blast results can afterwards done with a high level language (SQL). Please note that the BioJava scanner does not work with actual BLAST-versions. File sizes for the blast files has been about 1 (small), 14 (medium) and 140 (large) Mb

Mode	small	medium	large	memory(Mb)
blast-biojava	2.019	8.055	err	1054
blast-bioperl	4.026	47.822	nd	21
blast-flex	0.051	0.567	4.237	20
blast-jflex	0.607	1.906	8.532	863
blast-re2c	0.027	0.283	2.094	19.7
blast-zerg	0.017	0.185	1.331	6.5
blast-tclkit851	35.480	nd	nd	10.1

Comparison of several scanner generators for a simple BLAST scanner

dgroth — Tue, 10 Apr 2007 13:52:12 +0000

Sample: BlastFile with 1 to 10.000 result items

Mode	1	10	100	1000	10000
flex	0.003	0.015	0.199	1.979	25.548
flex-tcl	0.005	0.018	0.167	1.775	20.701
gcj	0.099	0.149	0.784	7.536	83.421
gij	0.109	0.482	4.917	51.939	nd
java	0.228	0.348	0.753	3.048	27.806
javaip	0.180	0.517	4.715	49.852	nd
plex	0.011	0.082	0.856	9.565	107.987
perl	0.031	0.050	0.235	2.280	23.916
re2c	0.004	0.012	0.076	0.765	8.438
tcl	1.702	12.524	140.249	nd	nd

The Re2c based scanner is the fastest, but the setup and the coding is more complicated than for the other scanners.
Flex-based scanners are 2-3 times slower than Re2c based scanners, regardless if there is an embedded Tcl-interpreter for better string handling (flex-tcl), Jflex code (java), executed with the Sun-Java Hotspot virtual machine (1.5) as well as to machine code compiled Jflex code (java-gcj) and Plex (sbs-plex = Pascal lex) based scanners are about 5 and 10 times slower than Re2c based scanners. Interpreted Java-Code either executed with the Sun-interpreter (java-ip = “java -Xint”) or with the gnu-interpreter (java-gij) is about 50 times slower than Re2c-Code. The Tcl based scanner is about 1000 times slower than the Re2c based. The per scanner is a line based scanner thereof not able to do complicated scanning with more than two states or patterns on the same line.