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Commit 94699abd authored by Simon McVittie's avatar Simon McVittie
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pv-runtime: Use threads to enumerate graphics drivers in parallel


SrtSystemInfo is not thread-aware, but can safely be handed off from
one thread to another, and caches its results internally; so we can use
a thread per architecture, plus an extra thread for cross-architecture
Vulkan and EGL ICDs, to enumerate graphics drivers and populate the
cache in parallel with any other container setup. We join the threads
just before looking at their results, to maximize the length of time
for which we're running in parallel.

On slow hardware (Lenovo T520 circa 2011, with 500G 7200rpm HDD) this
cuts something like 20% off the setup time with a cold cache
(`echo 3 | sudo tee /proc/sys/vm/drop_caches`). It also has a benefit
(more like 15%) with a warm cache, immediately after a previous
pressure-vessel run.

This does make it somewhat harder to profile pressure-vessel, because
when two I/O-bound operations run in parallel, they both take longer
than they otherwise would, even though the overall task finishes sooner;
this makes it hard to attribute I/O cost to particular actions. The
new --single-thread option can be used to get a better idea of where
the time is really going.

Signed-off-by: default avatarSimon McVittie <smcv@collabora.com>
parent 98ac00a1
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1 merge request!307pressure-vessel: Speed up graphics driver discovery by operating in parallel
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