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client: avoid CPU starvation when GPU computing is suspended 

Suppose we have 1 CPU and have (only) a GPU job that takes 1 CPU.
If GPU computing is suspended we won't fetch GPU work,
because the RR simulation doesn't take "suspended" into account.

Solution: in the RR simulation, if GPU computing is suspended,
act like GPU jobs don't use any CPU.
Seems like this should work though there may be unintended consequences.
This commit is contained in:
David Anderson 2020-05-10 19:27:10 -07:00
parent 8a75eb80c2
commit a327a0e249
1 changed files with 10 additions and 3 deletions
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13
client/rr_sim.cpp
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@ -97,10 +97,17 @@ struct RR_SIM {
inline void activate(RESULT* rp) {
PROJECT* p = rp->project;
active.push_back(rp);
rsc_work_fetch[0].sim_nused += rp->avp->avg_ncpus;
p->rsc_pwf[0].sim_nused += rp->avp->avg_ncpus;
int rt = rp->avp->gpu_usage.rsc_type;
// if this is a GPU app and GPU computing is suspended,
// don't count its CPU usage.
// That way we'll fetch more CPU work if needed.
//
if (!rt || !gpu_suspend_reason) {
rsc_work_fetch[0].sim_nused += rp->avp->avg_ncpus;
p->rsc_pwf[0].sim_nused += rp->avp->avg_ncpus;
}
if (rt) {
rsc_work_fetch[rt].sim_nused += rp->avp->gpu_usage.usage;
p->rsc_pwf[rt].sim_nused += rp->avp->gpu_usage.usage;