I am running the following command from various versions of Sage:
./sage -sh -c 'IPYTHONDIR="$DOT_SAGE/ipython" IPYTHONRC=ipythonrc strace
2>&1 >/dev/null python "$SAGE_LOCAL/bin/sage-ipython" -i' </dev/null
|grep -c '^open('
This shows the number of open() system calls in a Sage run (whether they
are successful calls or not). These calls seem to be responsible of the
majority of the startup time. The big advantage is that this is a much
more stable metric, i.e. it doesn't depend on the system load, whether
files are cached or hardware speed.
The results on sage.math:
sage-4.6: 19834
sage-4.7: 20114
sage-4.8: 19496
sage-5.0.1: 19061
sage-5.1: 18976
sage-5.2: 29818
I propose this is made into a doctest to replace the current startup.py
test. One could debate whether to count all system calls, all
file-related system call, only failed calls...
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