24.11.2015 09:10, liviuslivius wrote:
> Where can i find this in code?
In cch.cpp:
CCH_fetch() -> CCH_fetch_lock() -> get_buffer() and below
CCH_release() and below
Just FYI, this is how the difference look like in the profiler output:
v2.5.5:
10,10% libfbembed.so.2.5.6 get_buffer
9,23% libfbembed.so.2.5.6 DPM_next
9,02% libfbembed.so.2.5.6 get_record
7,76% libfbembed.so.2.5.6 CCH_release
4,04% libfbembed.so.2.5.6 latch_bdb
3,58% libfbembed.so.2.5.6 CCH_fetch_lock
2,83% libfbembed.so.2.5.6 CCH_handoff
2,49% libfbembed.so.2.5.6 VIO_next_record
2,28% libfbembed.so.2.5.6 lock_buffer
v3.0.0:
12,10% libEngine12.so Firebird::SyncObject::lock
8,06% libEngine12.so Firebird::SyncObject::unlock
7,08% libEngine12.so DPM_next
5,22% libEngine12.so Jrd::BufferDesc::release
4,38% libEngine12.so Jrd::BufferDesc::addRef
4,11% libEngine12.so Firebird::AtomicCounter::exchangeBitOr
3,48% libEngine12.so latch_buffer
3,45% libEngine12.so adjust_scan_count
3,40% libEngine12.so get_buffer
2,39% libEngine12.so CCH_fetch_lock
2,10% libEngine12.so CCH_release
> you know, more heads more concepts
The cache access "concept" has not been changed since 1980s. Only its
cost has raised recently.
Dmitry
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