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Use fftw_planner_nthreads #526

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406f083
Use fftw_planner_nthreads
Aug 19, 2024
9dd3af4
fix: re-introduce undesired fftw_plan_safe
Aug 22, 2024
4502207
Merge branch 'flatironinstitute:master' into planner_nthreads
jkrimmer Aug 22, 2024
be1f664
Merge branch 'plan_safe' into planner_nthreads
jkrimmer Aug 22, 2024
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4 changes: 4 additions & 0 deletions include/finufft/fftw_defs.h
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Expand Up @@ -14,9 +14,9 @@
// macro to prepend fftw_ (for double) or fftwf_ (for single) to a string
// without a space. The 2nd level of indirection is needed for safety, see:
// https://isocpp.org/wiki/faq/misc-technical-issues#macros-with-token-pasting
#define FFTWIFY_UNSAFE(x) fftwf_##x

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#else
#define FFTWIFY_UNSAFE(x) fftw_##x

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#endif
#define FFTWIFY(x) FFTWIFY_UNSAFE(x)
// now use this tool (note we replaced typedefs v<=2.0.4, in favor of macros):
Expand All @@ -38,11 +38,15 @@
#define FFTW_INIT FFTWIFY(init_threads)
#define FFTW_PLAN_TH FFTWIFY(plan_with_nthreads)
#define FFTW_CLEANUP_THREADS FFTWIFY(cleanup_threads)
#define FFTW_GET_NTHREADS FFTWIFY(planner_nthreads)
#define FFTW_PLAN_SF FFTWIFY(make_planner_thread_safe)
#else
// no OMP (no fftw{f}_threads or _omp), need dummy fftw threads calls...
#define FFTW_INIT()
#define FFTW_PLAN_TH(x)
#define FFTW_CLEANUP_THREADS()
#define FFTW_GET_NTHREADS()
#define FFTW_PLAN_SF()
#endif

#endif // FFTW_DEFS_H
3 changes: 3 additions & 0 deletions src/finufft.cpp
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Expand Up @@ -664,6 +664,7 @@
std::lock_guard<std::mutex> lock(fftw_lock);
if (!did_fftw_init) {
FFTW_INIT(); // setup FFTW global state; should only do once
FFTW_PLAN_SF();
did_fftw_init = true; // ensure other FINUFFT threads don't clash
}
}
Expand Down Expand Up @@ -760,10 +761,12 @@
// set it just for our one plan and then revert to the user value.
// Unfortunately fftw_planner_nthreads wasn't introduced until fftw 3.3.9, and
// there isn't a convenient mechanism to probe the version
int prev_nthr_fft = FFTW_GET_NTHREADS();

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FFTW_PLAN_TH(nthr_fft);
p->fftwPlan = FFTW_PLAN_MANY_DFT(dim, ns, p->batchSize, (FFTW_CPX *)p->fwBatch,
NULL, 1, p->nf, (FFTW_CPX *)p->fwBatch, NULL, 1,
p->nf, p->fftSign, p->opts.fftw);
FFTW_PLAN_TH(prev_nthr_fft);
}
if (p->opts.debug)
printf("[%s] FFTW plan (mode %d, nthr=%d):\t%.3g s\n", __func__, p->opts.fftw,
Expand Down
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