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Berkeley upc memory fence7/14/2023 This value limits the total per-node shared memory segment space. Here's an example from a system configured for up to 20G of shared memory: $df -h /dev/shm /var/shm /run/shmĭf: '/var/shm': No such file or directoryĭf: '/run/shm': No such file or directory You can confirm this by looking at the virtual file system where that resides. For smp-conduit, this is the only mode of operation.Īssuming this is a Linux system with configure defaults, the most likely explanation is exhaustion of the kernel-provided POSIX shared memory space. | -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5 -lgcc -lmĮDIT2: Following is the output of df -h /dev/shm command jointinvsurf5_cajoint_compile]$ df -h /dev/shmįilesystem Size Used Avail Use% Mounted onīy default, Berkeley UPC uses kernel shared memory services to cross-map the UPC shared segments between co-located processes. | conduit -lgasnet-ibv-seq -libverbs -lpthread -lrt | -L/data/seismo82/avinash/Programs/myupc/opt/gasnet/ibv. | -L/data/seismo82/avinash/Programs/myupc/opt/umalloc | -std=gnu99 -L/data/seismo82/avinash/Programs/myupc/opt Linker flags | -D_GNU_SOURCE=1 -O3 -param Linker | /data/seismo82/avinash/Programs/openmpiinstall/bin/mpic | -Wunused-result -Wno-unused-parameter -Wno-address | large-function-growth=200000 -Wno-unused | (C) 2015 Free Software Foundation, Inc.Ĭ compiler flags | -O3 -param max-inline-insns-single=35000 -param Runtime interface # | Runtime supports 3.0 -> 3.13: Translator uses 3.6 | segment_fast,os_linux,cpu_x86_64,cpu_64,cc_gnu,Ĭonfigure id | range Tue Feb 11 23:18: gnome-initial-setupīinary interface | 64-bit x86_64-unknown-linux-gnu | notrace,nostats,nodebugmalloc,nogasp,nothrille, | upc_atomics,pupc,upc_types,upc_castable,upc_nb,nodebug, | upc_trace_mask,upc_local_to_shared,upc_all_free, | upc_sem,upc_dump_shared,upc_trace_printf, | upc_memcpy_vis,upc_ptradd,upc_thread_distance,upc_tick, | gasnet,upc_collective,upc_io,upc_memcpy_async, | 019.4.0.cgi' '-with-sptr-packed-bits=20,9,35'Ĭonfigure features | trans_bupc,pragma_upc_code,driver_upcc,runtime_upcr, Pthreads support | available (if used, default is 2 pthreads per process) This is upcc (the Berkeley Unified Parallel C compiler), v. The UPC build was compiled using flags -with-sptr-packed-bits=20,9,35 that allows up to 2^35 = 32 GB of shared memory per thread.ĮDIT1: Following is the output of the command upcc -version jointinvsurf5_cajoint_compile]$ upcc -version I cannot over-ride it even with a the shared-heap flag where I am clearly asking for 5 GB per thread. I don't understand why the Total shared memory limit is 128 GB which is half of the total physical memory present. NOTICE: We recommend linking the debug version of GASNet to assist you in resolving this application issue. NOTICE: Before reporting bugs, run with GASNET_BACKTRACE=1 in the environment to generate a backtrace. Upc_alloc unable to service request from thread 245248 more bytes Total shared memory limit: 2515 MB per-thread, 128281 MB total Global shared memory in use: 0 MB per-thread, 1 MB total Local shared memory in use: 1594 MB per-thread, 81340 MB total The following should work because 51 x 5 = 255 GB available (2515 MB) on node 0 (range): using 2515 MB per thread instead However the code fails to run because it cannot find enough memory. I am trying to run a Berkeley UPC code on a computer with 64 cores and 256 GB RAM.
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