Github user nickva commented on the issue:
https://github.com/apache/couchdb-couch/pull/239
@davisp @eiri
I tried a 5 minute eprof run. At default 500 max_dbs_open. Cluster had 20
continuous 1-to-n replications.
```
==== master + ETS lru (this PR)
eprof:start_profiling([couch_server], {couch_lru, '_', '_'}),
timer:sleep(300000), eprof:stop_profiling(), eprof:analyze(), eprof:stop().
****** Process <4641.251.0> -- 100.00 % of profiled time ***
FUNCTION CALLS % TIME [uS / CALLS]
-------- ----- ------- ---- [----------]
couch_lru:insert/2 564 1.46 11437 [ 20.28]
couch_lru:close_int/3 1800 5.36 42068 [ 23.37]
couch_lru:close/1 450 6.29 49341 [ 109.65]
couch_lru:update/2 26542 86.90 681987 [ 25.69]
--------------------- ----- ------- ------ [----------]
Total: 29356 100.00% 784833 [ 26.74]
==== master + monotonic counter
(https://github.com/cloudant/couchdb-couch/commit/4b49e71c14837c0f1b63e5d0ba2fea34c5fd997e)
eprof:start_profiling([couch_server], {couch_lru, '_', '_'}),
timer:sleep(300000), eprof:stop_profiling(), eprof:analyze(), eprof:stop().
****** Process <4641.251.0> -- 100.00 % of profiled time ***
FUNCTION CALLS % TIME [uS / CALLS]
-------- ----- ------- ---- [----------]
couch_lru:close_int/2 323 1.50 13817 [ 42.78]
couch_lru:insert/2 621 2.36 21723 [ 34.98]
couch_lru:close/1 320 3.90 35962 [ 112.38]
couch_lru:update/2 25953 92.24 849899 [ 32.75]
--------------------- ----- ------- ------ [----------]
Total: 27217 100.00% 921401 [ 33.85]
==== current master
eprof:start_profiling([couch_server], {couch_lru, '_', '_'}),
timer:sleep(300000), eprof:stop_profiling(), eprof:analyze(), eprof:stop().
****** Process <4641.251.0> -- 100.00 % of profiled time ***
FUNCTION CALLS % TIME [uS / CALLS]
-------- ----- ------- ---- [----------]
couch_lru:close_int/2 513 1.60 22893 [ 44.63]
couch_lru:insert/2 727 2.06 29407 [ 40.45]
couch_lru:close/1 507 3.90 55623 [ 109.71]
couch_lru:update/2 35114 92.44 1318808 [ 37.56]
--------------------- ----- ------- ------- [----------]
Total: 36861 100.00% 1426731 [ 38.71]
```
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