Hi All,
Just thought I would share some timings I have made to determine what
effect adding dependencies has on loading request time.
I made four apps using the Eclipse plugin and modified 3 of them to
add or remove jars from the war/WEB-INF/lib directory.
Normal - default jars (13.2 MB)
Small - removed all persistence related jars leaving two GAE API jars
(10.2 MB)
Large - added lots of jars from various projects (51MB)
Very basic testing procedure - I would just wait a few minutes and
reload the Hello world servlet. Normally one minute was long enough
to cause a loading request. However I did notice that waiting longer
(5 mins) seemed to cause a longer wall clock time - perhaps there are
several layers of caching for app resources that can expire.
Averages discard the highest timings:
Total ms CPU ms
Small 4079 501
514 501
598 535
541 552
617 518
664 535
_____________
587 528
Normal 739 585
656 535
636 585
595 552
598 535
621 552
1148 552
_____________
640 556
Large 2274 1372
1155 1171
2690 1422
4064 1255
1906 1272
1077 1188
2817 1355
______________
1986 1296
Some things to notice:
1 - Often the CPU ms (which comes off your quota) often has the same
value. e.g. 535ms and 552ms each appear four times. That seems to
indicate that some discreet function is used to calculate the cost of
loading your app.
2 - It seems that each 1MB of dependencies added takes about 35ms of
clock time to load and adds about 19ms to your CPU quota. However,
this figures will probably vary depending on if the file is already
loaded (by another app?) and possibly other factors. It is also
possible that the extra load time is related to the number of jars
rather than just their size.
3 - removing the standard persistence jars does seem to have some effect
John
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