Suppressing PMCX Output
Darian Fuxfell
I’ve been using PMCX for some time now, but the inability to silence its output is becoming an issue. it’s preventing me from seeing other feedback from my code. Is there a way to disable or redirect this output?
nphoton: 2e+06
tstart: 0
tstep: 1e-08
tend: 1e-08
maxdetphoton: 2e+06
unitinmm: 1
issaveexit: 1
issave2pt: 0
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GPU=1 (NVIDIA GeForce RTX 3090) threadph=5 extra=320640 np=2000000 nthread=335872 maxgate=1 repetition=1
initializing streams ... init complete : 2 ms
requesting shared memory: 1536 bytes
launching MCX simulation for time window [0.00e+00ns 1.00e+01ns] ...
simulation run# 1 ...
kernel complete: 84 ms
retrieving fields ... detected 1999617 photons, total: 1999617 simulated 2000000 photons (2000000) with 335872 threads (repeat x1)
MCX simulation speed: 333333.33 photon/ms
total simulated energy: 2000000.00 absorbed: 0.00000%
(loss due to initial specular reflection is excluded in the total)
Qianqian Fang
you can set cfg['flog'] to a string denoting the log file path to
save the output to the log file instead of printing; on Linux or
Mac, you can use /dev/null to suppress the log printing
cfg['flog']='/dev/null'
otherwise, if you set a path to a log file, the output will also not be printed.
if you just set cfg['flog'] to 0, the banner will not be printed, but the GPU log will still be printed.
Same can be done with mcxlab (use cfg.flog) or mcx binary (-l),
see mcxlab help info on this field
https://github.com/fangq/mcx/blob/v2025.10/mcxlab/mcxlab.m#L330-L335
unfortunately, the printed nphoton/tstart/... values can not be
hidden at the moment as it is not directed to cfg.flog. it should
still be much cleaner regardless.
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