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Howard Chu @hyc_symas
, 4 tweets, 3 min read Read on Twitter
@fanf42 @walterbio LMDB is significant of course, but even back-bdb/hdb had dropped latency down to 0.8ms. There were huge improvements all across the stack. Faster encode/decode in liblber, faster processing in libldap, complete restructuring of slapd internal APIs, etc.
@fanf42 @walterbio The result of years of intensive profiling and testing.

Some simple rules throughout, of course: avoid memcpy, avoid malloc, avoid strlen. These 3 functions used to be 75% of execution time. E.g. liblber now does zero-copy decode.
@fanf42 @walterbio Use of plain char* C strings inside slapd was eliminated; use Bervals everywhere instead. Saved endless repeated calls to strlen. (Another rule - don't repeat the same computation over the same data; keep the result if it will be needed again soon.)
@fanf42 @walterbio For the rest, you'll have to come to my talk in Tubingen on Monday.
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