Messages in this thread | | | Subject | Re: [patch] SMP alternatives | From | Arjan van de Ven <> | Date | Thu, 24 Nov 2005 14:12:07 +0100 |
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> Just a note to say glibc is getting better wrt to locking. > Compare the results and trival test program here: > http://lkml.org/lkml/2001/12/7/75 > That showed that for glibc 2.2.4, getc & putc > were 669% slower than the unlocked versions. > > 4 years later and with 2.3.5-1ubuntu1, getc & putc > are only 230% slower than the unlocked versions: > > $ dd bs=1MB count=100 if=/dev/zero | ./locked >/dev/null > 100000000 bytes transferred in 3.709362 seconds (26958813 bytes/sec) > $ dd bs=1MB count=100 if=/dev/zero | ./unlocked >/dev/null > 100000000 bytes transferred in 1.602427 seconds (62405339 bytes/sec)
this could also mean that the unlocked version has gotten slower ;)
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