This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
On 02/20/2017 09:36 PM, Carlos O'Donell wrote:
On 02/20/2017 11:01 AM, Rajalakshmi Srinivasaraghavan wrote:On 02/20/2017 07:12 PM, Carlos O'Donell wrote:On 02/14/2017 06:05 AM, Rajalakshmi Srinivasaraghavan wrote:P7 code is used for <=32B strings and for > 32B vectorized loops are used. This shows as an average 25% improvement depending on the position of search character. The performance is same for shorter strings. Tested on ppc64 and ppc64le.What did you use to test the 25% improvement?This improvement is seen when compared to power7. Benchtest is modified to use length from 0 to 400 to find the average for different lengths.Could you post your modifications for review an explain your process in a little more detail. I'm curious about the changes you made.
I modified benchtest/bench-strrchr.c to measure only the following loop and commented the existing 'for' loops. for (i = 0; i < 400; ++i) { do_test (0, i, i + 1, 0, SMALL_CHAR); do_test (i, i, i + 1, 0, BIG_CHAR); } Then the benchtests generated is copied to a spreadsheet to calculate the improvement. Attached is the benchtests result for ppc64le. Note: The numbers vary slightly from run to run. -- Thanks Rajalakshmi S
Attachment:
bench-result
Description: Text document
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |