> I had some surprising results of the speed command when testing the
> md5 speed on the 1.1.0-stable branch (for both a shared and a static
> build):
> openssl speed md5 returns:
> type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
> 16384 bytes
> md5 115869.46k 268237.29k 473617.41k 589905.92k
> 636772.35k 639429.29k
>
> openssl speed -evp md5 returns:
> type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
> 16384 bytes
> md5 53991.08k 160454.36k 364985.86k 537559.38k
> 624238.59k 633066.84k
>
> On the other hand, with 1.0.1 and 1.0.2-stable using a static build I get:
> md5 38045.25k 123423.76k 310729.30k 505120.09k 620333.74k
> md5 43182.80k 135651.38k 331369.48k 518042.97k 622193.32k
>
> Using a shared build I get:
> md5 57529.01k 169850.56k 376685.74k 545938.09k 626952.87k
> md5 65634.19k 186133.65k 397608.96k 558070.78k 629697.19k
>
> So was surprised me is that speed for small packets seems to be a
> lot better in 1.1.0 when not using the EVP interface, but worse when
> using it compared to 1.0.2. It this expected behaviour?
Yes. In 1.1.0 speed md5 calls MD5() directly, as result 1.1.0 speed md5
is always faster than speed -evp md5 [for smaller inputs]. And in 1.0.x
speed md5 invokes EVP_Digest(...,EVP_get_digestbyname("md5"),...) in
inner loop, while speed -evp md5 effectively takes EVP_get_digestbyname
out of inner loop, so that -evp md5 is faster.
As for variations between static vs. shared. Is your operating frequency
variable? What I'm hinting at is that bringing a shared library into
address space means some additional computations, and adaptive frequency
increase is likely to kick in earlier, which would [positively] affect
first column. But second column should be same, and it's not... Another
possibility is relative position of pieces of code modulo cache size. I
mean differences might be side effect of cache contention, which are
relatively diminishing with input length.
> Sha1 doesn't seem to have this difference for instance.
Well, compare sha256 vs. -evp sha256 in 1.0.2 then :-)
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