Amit <amit.uttam@...> writes: > > Hello, > > Looking at *crypto/sha/asm/sha1-x86_64.pl*, there is a measurement that > states 5.3 cycles / byte when computing the sha1. > > How was this measurement obtained? I tried using linux perf tools and > got close to this figure but I am not sure if I am performing the > correct test. > > Thanks, > Amit
Linux perf tools is great, however, if you just want to measure the number of cycles for *SHA1_Update*, systemtap is a better option. Note that in order to support user space probes, you need to compile the latest kernel (3.5 or greater) and use the latest systemtap from git. Running systemtap on a Core i7 2600 3.4GHz, I was able to get around 5 cycles/byte +-0.2 cycles. Which is consistent with the measurement in sha1-x86_64.pl. Thanks, Amit ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
