Hi Przemek, Many thanks for the detailed and insightful notes. It was indeed very curious to accept that a sub minor version would break performance in a product of this nature.
BTW, do you know of a reason why HB_FM_DL_ALLOC should not be set by default? Thanks again, Ron -------------------------------------------------- From: "PrzemysławCzerpak" <dru...@acn.waw.pl> Sent: Tuesday, March 01, 2011 4:05 AM To: "Andi Jahja" <andi.ja...@yahoo.co.id>; "Xharbour-Developers List" <xharbour-developers@lists.sourceforge.net> Subject: Re: [xHarbour-developers] ChangeLog: 2011-02-28 15:40 UTC+0700 Andi Jahja <xharbour/AT/telkom/net/id> > On Mon, 28 Feb 2011, Andi Jahja wrote: > > Hi, > >> 2011-02-28 15:40 UTC+0700 Andi Jahja <xharbour/AT/telkom/net/id> >> * source/vm/fm.c >> ! enable use of DL malloc to Windows OS > > It should be available for all OS-es if user sets HB_FM_DL_ALLOC > > HB_MT_VM is Harbour only macro. In xHarbour the closest meaning > has HB_THREAD_SUPPORT macro. > >> * source/vm/dlmalloc.c >> + added SVN file Id >> ; REFRESH NOTE : >> DL malloc is a group of functions which will replace the use of >> compiler's >> native malloc/free/realloc written by Doug Lea. My stress tests >> disclosed >> that it (ver 2.8.3) is very stable and can boost speed performance >> in the >> range of 30-40%. Actually, version 2.8.4 has been released on May >> 24, 2009 >> but, IMO we'd better stick to version 2.8.3 due to it's stability >> and not >> much improvement offers by the newer version. Instead, version >> 2.8.4 >> _degrades_ OpenWatcom performance, ie. makeing OW application run >> 2x >> slower (!) > > Above is completely false information (some serious problems which can > be exploited by user code were fixed in 2.8.4) and you have to make > something wrong in your tests or your xHarbour builds. > This are speedtst results for windows OW builds from current Harbour SVN: > > HB_FM_DL_ALLOC (above modified 2.84 version) > [ total application time: ]....................................23.00 > [ total real time: ]...........................................23.19 > > HB_FM_STD_ALLOC > [ total application time: ]....................................26.30 > [ total real time: ]...........................................26.50 > > So DL malloc is faster then then memory manager used by OpenWatcom which > is one of the fastest MM. In OW MM the speed improvement is reached in > rather unpleasure way - it simply does not free unused memory to system. > Of course it has to improve the speed when very larger blocks are > allocated and freed many times but the cost is rather unacceptable in > multiprocess environment. See OpenWatcom source code for details. > Anyhow DL malloc is faster even without such tricks and of course you can > tune it using build time macros to work just like OW MM. > >> + source/vm/dlmalloc_version_284.c >> ! new version of dlmalloc uploaded just for library (please read >> above note) > > This is not pure dlmalloc 2.84 but modified by me version from Harbour SVN > repository with OS2 support, spinlocks support fixes for strict aliasing > optimization and some minor build fixes for different platforms/compilers. > This code needs Harbour headers to be fully functional. > Please leave at least some basic information about it. > > best regards, > Przemek > > ------------------------------------------------------------------------------ > Free Software Download: Index, Search & Analyze Logs and other IT data in > Real-Time with Splunk. Collect, index and harness all the fast moving IT > data > generated by your applications, servers and devices whether physical, > virtual > or in the cloud. Deliver compliance at lower cost and gain new business > insights. http://p.sf.net/sfu/splunk-dev2dev > _______________________________________________ > xHarbour-developers mailing list > xHarbour-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xharbour-developers > ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ xHarbour-developers mailing list xHarbour-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xharbour-developers
