nickva edited a comment on issue #3517:
URL: https://github.com/apache/couchdb/issues/3517#issuecomment-890372099
I confirmed that the JS engine is implicated. I ran 2.3.1 and 3.x latest on
Ubuntu 20.04. For 3.x I installed the libmozjs185 couchdb-build package for
Ubuntu 18.04 on my Ubuntu 20.04 system and ran with q=8 to minimize difference
and similar performance numbers as 2.3.1.
Packages I downloaded and installed manually:
```
couch-libmozjs185-1.0_1.8.5-1.0.0+couch-2_bionic_amd64.deb
couch-libmozjs185-dev_1.8.5-1.0.0+couch-2_bionic_amd64.deb
libffi6_3.2.1-8_amd64.deb
libffi-dev_3.2.1-8_amd64.deb
```
(libffi6 was needed as a dependency of couch-libmozjs185)
Configure 3.x to build with version 1.8.5
```
./configure --spidermonkey-version 1.8.5 --dev
```
Test script was modified to not set up docker containers, just run locally
with 2.3.1 and 3.1.1 running on different ports.
```
./couchdb-test.sh query
CouchDB performance regression test script
Assuming that setup is already complete
================ Query CouchDB 2.3.1 ================
{"couchdb":"Welcome","version":"2.3.1","git_sha":"c298091a4","uuid":"fake_uuid_for_dev","features":["pluggable-storage-engines","scheduler"],"vendor":{"name":"The
Apache Software Foundation"}}
Query Database views on port 15994
Round: 1/10
real 0m13.022s
user 0m0.023s
sys 0m0.023s
Round: 2/10
real 0m7.234s
user 0m0.020s
sys 0m0.008s
Round: 3/10
real 0m6.715s
user 0m0.026s
sys 0m0.000s
Round: 4/10
real 0m7.021s
user 0m0.018s
sys 0m0.009s
Round: 5/10
real 0m7.159s
user 0m0.005s
sys 0m0.021s
Round: 6/10
real 0m7.318s
user 0m0.014s
sys 0m0.014s
Round: 7/10
real 0m7.464s
user 0m0.007s
sys 0m0.021s
Round: 8/10
real 0m7.175s
user 0m0.016s
sys 0m0.011s
Round: 9/10
real 0m7.096s
user 0m0.004s
sys 0m0.023s
Round: 10/10
real 0m7.235s
user 0m0.006s
sys 0m0.022s
```
```
q=8
================ Query CouchDB 3.1.1 ================
{"couchdb":"Welcome","version":"3.1.1-ba63878","git_sha":"ba63878","uuid":"fake_uuid_for_dev","features":["access-ready","partitioned","pluggable-storage-engines","reshard","scheduler"],"vendor":{"name":"The
Apache Software Foundation"}}
Query Database views on port 15984
Round: 1/10
real 0m5.979s
user 0m0.017s
sys 0m0.010s
Round: 2/10
real 0m6.757s
user 0m0.013s
sys 0m0.013s
Round: 3/10
real 0m7.112s
user 0m0.012s
sys 0m0.016s
Round: 4/10
real 0m7.359s
user 0m0.017s
sys 0m0.011s
Round: 5/10
real 0m7.210s
user 0m0.017s
sys 0m0.013s
Round: 6/10
real 0m7.233s
user 0m0.008s
sys 0m0.021s
Round: 7/10
real 0m6.284s
user 0m0.028s
sys 0m0.000s
Round: 8/10
real 0m7.101s
user 0m0.020s
sys 0m0.008s
Round: 9/10
real 0m6.943s
user 0m0.022s
sys 0m0.006s
Round: 10/10
real 0m6.736s
user 0m0.016s
sys 0m0.011s
```
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