leonarski_fandClaude Opus 5.5
6936b04d5f
cuFFT ships its transforms as PTX for every card (cuFFT 11 and 12 alike), so each plan has the driver compile kernels, and a second plan of the same shape compiles them again. From the driver's JIT cache that costs ~0.5 ms a plan; without it 45-130 ms, under cuFFT's process-wide lock - which, over the ~100 plans of molecular replacement, matches the stage pattern of the slow MR in the production broker. The cache is unusable in more ways than CUDA_CACHE_DISABLE: with no HOME at all (a systemd system service without User= gets none, and the driver does not fall back to the passwd entry), on a read-only or unwritable directory, on a filesystem whose fcntl locks fail (NFS without locking) - each measured as slow as no cache - or on a slow network filesystem (each plan opens and locks the cache ~10 times). - common/CudaJitCache: the path the driver uses (CUDA_CACHE_PATH, else $HOME/.nv/ComputeCache), its filesystem type, whether it is writable, whether its index opens read-write and takes the driver's fcntl read lock, CUDA_CACHE_DISABLE and a CUDA_CACHE_MAXSIZE below 64 MiB. One line: info when fine, a warning with the cause and the remedy (CUDA_CACHE_PATH on a local disk) when not, or when a plan takes over 10 ms. - WarmUpCuFFT returns the fastest of three 64^3 R2C plan makes after a first one that pays the initialisation (and a cold-cache compile): ~2 ms in all with a cache, ~0.3 s without. - jfjoch_broker runs it after its version line (0.15 s at start, cuFFT init and card 0's context included); rugnux on its existing background warm-up thread. - CUDAMemHelpers.h: the modules are PTX on every platform, not only on Windows. No result changes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PXc1zD1yxHqaR1DGdCTHL4
Jungfraujoch
Application to receive and analyse data from the PSI JUNGFRAU and EIGER detectors, together with
rugnux, its program for processing stored diffraction data - rotation and serial, macromolecular
and small-molecule - from images to merged reflections.
All documentation is now placed in docs/ subdirectory and for the current version hosted on Jungfraujoch Read The Docs page.