Changes between Initial Version and Version 1 of Profiling/Examples

Timestamp:

12/11/13 10:24:56 (6 years ago)

Author:

Antoine Martin

Comment:

--

Profiling/Examples

@@ +1 @@
+= Profiling Examples =
+
+{{{#!div class="box"
+== maths.py re-written in Cython ==
+Merged in r2462
+
+[[BR]]
+
+* Before:
+{{{
+$ XPRA_CYTHON_MATH=0 ./tests/xpra/test_maths.py 
+calculate_time_weighted_average(100000 records)=(0.5129547191923681, 0.529864013016996)
+elapsed time: 72.6ms
+test_calculate_timesize_weighted_average(100000 records)=(70109.42497899215, 22337.16293859974)
+elapsed time: 204.9ms
+}}}
+* After:
+{{{
+$ XPRA_CYTHON_MATH=1 ./tests/xpra/test_maths.py 
+calculate_time_weighted_average(100000 records)=(0.5226684212684631, 0.5245391130447388)
+elapsed time: 4.0ms
+test_calculate_timesize_weighted_average(100000 records)=(180154.15625, 35980.69140625)
+elapsed time: 19.7ms
+}}}
+Which is 10 to 20 times faster.
+}}}
+
+{{{#!div class="box"
+== high network cost in UI thread ==
+Work in progress, see #231
+}}}
+
+{{{#!div class="box"
+== Fixing an expensive logging call (in a hotpath) ==
+This is a recurring problem, see: r2294, r2290, etc
+
+By running the server with:
+{{{
+xpra start :10 --start-child=glxgears
+}}}
+And the client with:
+{{{
+./tests/scripts/pycallgraph -t draw -i '*' -r 20 -- attach :10 --no-mmap
+}}}
+We find that logging is really costing us dearly:
+[[BR]]
+[[Image(pycallgraph-draw-loggingisexpensive.png)]]
+[[BR]]
+So we remove logging from this critical path in r2484, and we now find:
+[[BR]]
+[[Image(pycallgraph-draw-loggingremoved.png)]]
+[[BR]]
+That's a saving of about 35% - not bad for such a small change!
+}}}