>Subject: Str[N]Compare performance in 4.0
>From: Ken Krugler <[EMAIL PROTECTED]>
>Date: Fri, 08 Jun 2001 15:51:26 -0700
>
>> > From: Kevin
>> >
>> > I have a commerical application that has run fine under
>> > all 3.x version of PalmOS. Under 4.0 it runs very slowly.
>> > I have not been able to pinpoint any particular API calls
>> > that run slower. It appears as if the C code just runs
>> > slower especially string manipulation and searching.
>> > Anyone had a similar experience?
>> >
>>
>>I think you'll find that StrCompare() and StrNCompare() are slower in the
>>4.0 SDK.
>
>StrCompare should be roughly comparable in speed, less the trap
>dispatch overhead of calling through to TxtCompare.
>
>StrNCompare will be slower in 4.0 - the longer the strings you're
>passing in, the bigger the performance issue.
Somebody (perhaps the "pedit guy") did actual timing comparisons
and found Str[N]Compare was substantially slower on 4.0 than
on previous releases. The reason was the call to TxtCompare, which
uses multi-byte-based comparisons. There's also the overhead of
the trap in StrCompare.
So it is likely that the Str[N]Compare function is the culprit here.
If you don't need the muti-byte string support, then you can use
the Str[N]CompareAscii functions.
Roger Stringer
Marietta Systems, Inc.
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