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Posted to c-dev@xerces.apache.org by bu...@apache.org on 2001/10/26 11:59:47 UTC

DO NOT REPLY [Bug 4442] New: - BinMemInputStream::readBytes is inefficient

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=4442

BinMemInputStream::readBytes is inefficient

           Summary: BinMemInputStream::readBytes is inefficient
           Product: Xerces-C++
           Version: Nightly build
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Utilities
        AssignedTo: xerces-c-dev@xml.apache.org
        ReportedBy: mlovett@uk.ibm.com


While profiling Xerces, we identified a significant CPU spike in the 
BinMemInputStream, when we copy some data from one buffer to another:

<    for (unsigned int index = 0; index < actualToRead; index++)
<        toFill[index] = fBuffer[fCurIndex++];

replacing this with:

>    memcpy(toFill, &fBuffer[fCurIndex], actualToRead);
>    fCurIndex += actualToRead;

gave a 2% overall increase in our application throughput, and removed the
spike from the profile.

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