我正在尝试Berkeley UPC在具有64核心和256 GBRAM的计算机上运行代码。但是，代码无法运行，因为找不到足够的内存。因为51 x 5 = 255 GB <256 GB
upcrun -n 51 -shared-heap=5GB xcorupc_sac inputpgas_sac{$rc1}.txt
..
UPCR: UPC thread 3 of 51 on range (pshm node 0 of 1, process 3 of 51, pid=191914)
UPCR: UPC thread 16 of 51 on range (pshm node 0 of 1, process 16 of 51, pid=191927)
UPC Runtime warning: Requested shared memory (5120 MB) > available (2515 MB) on node 0 (range): using 2515 MB per thread instead
UPC Runtime error: out of shared memory
Local shared memory in use: 1594 MB per-thread, 81340 MB total
Global shared memory in use: 0 MB per-thread, 1 MB total
Total shared memory limit: 2515 MB per-thread, 128281 MB total
upc_alloc unable to service request from thread 0 for 1672245248 more bytes
NOTICE: Before reporting bugs, run with GASNET_BACKTRACE=1 in the environment to generate a backtrace.
NOTICE: We recommend linking the debug version of GASNet to assist you in resolving this application issue.
我不明白，为什么Total shared memory limit是128 GB这是物理内存的一半存在的全部的。即使使用shared-heap我明确要求5 GB每个线程使用的标志，我也不能超越它。有什么建议 ？
cat /proc/meminfo
MemTotal: 263378836 kB
UPC构建是使用标志编译的--with-sptr-packed-bits=20,9,35，每个标志最多允许2 ^ 35 = 32 GB的共享内存。
EDIT1：以下是命令的输出 upcc --version
[avinash@range jointinvsurf5_cajoint_compile]$ upcc --version
This is upcc (the Berkeley Unified Parallel C compiler), v. 2019.4.4
(getting remote translator settings...)
----------------------+---------------------------------------------------------
UPC Runtime | v. 2019.4.4, built on Feb 11 2020 at 23:31:40
----------------------+---------------------------------------------------------
UPC-to-C translator | v. 2.28.0, built on Jul 19 2018 at 20:29:47
| host aphid linux-x86_64/64
| gcc v4.2.4 (Ubuntu 4.2.4-1ubuntu4)
----------------------+---------------------------------------------------------
Translator location | http://upc-translator.lbl.gov/upcc-2019.4.0.cgi
----------------------+---------------------------------------------------------
networks supported | smp udp mpi ibv
----------------------+---------------------------------------------------------
default network | ibv
----------------------+---------------------------------------------------------
pthreads support | available (if used, default is 2 pthreads per process)
----------------------+---------------------------------------------------------
Configured with | '--with-translator=http://upc-translator.lbl.gov/upcc-2
| 019.4.0.cgi' '--with-sptr-packed-bits=20,9,35'
| '--prefix=/usr/local/berkeley_upc/opt'
| '--with-multiconf-magic=opt'
----------------------+---------------------------------------------------------
Configure features | trans_bupc,pragma_upc_code,driver_upcc,runtime_upcr,
| gasnet,upc_collective,upc_io,upc_memcpy_async,
| upc_memcpy_vis,upc_ptradd,upc_thread_distance,upc_tick,
| upc_sem,upc_dump_shared,upc_trace_printf,
| upc_trace_mask,upc_local_to_shared,upc_all_free,
| upc_atomics,pupc,upc_types,upc_castable,upc_nb,nodebug,
| notrace,nostats,nodebugmalloc,nogasp,nothrille,
| segment_fast,os_linux,cpu_x86_64,cpu_64,cc_gnu,
| packedsptr,upc_io_64
----------------------+---------------------------------------------------------
Configure id | range Tue Feb 11 23:18:39 PST 2020 gnome-initial-setup
----------------------+---------------------------------------------------------
Binary interface | 64-bit x86_64-unknown-linux-gnu
----------------------+---------------------------------------------------------
Runtime interface # | Runtime supports 3.0 -> 3.13: Translator uses 3.6
----------------------+---------------------------------------------------------
| --- BACKEND SETTINGS (for ibv network) ---
----------------------+---------------------------------------------------------
C compiler | /usr/bin/gcc
| GNU/4.8.5/4.8.5 20150623 (Red Hat 4.8.5-39)
| gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) Copyright
| (C) 2015 Free Software Foundation, Inc.
----------------------+---------------------------------------------------------
C compiler flags | -O3 --param max-inline-insns-single=35000 --param
| inline-unit-growth=10000 --param
| large-function-growth=200000 -Wno-unused
| -Wunused-result -Wno-unused-parameter -Wno-address
| -std=gnu99
----------------------+---------------------------------------------------------
linker | /data/seismo82/avinash/Programs/openmpiinstall/bin/mpic
| c
| GNU/4.8.5/4.8.5 20150623 (Red Hat 4.8.5-39)
| gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) Copyright
| (C) 2015 Free Software Foundation, Inc.
----------------------+---------------------------------------------------------
linker flags | -D_GNU_SOURCE=1 -O3 --param
| max-inline-insns-single=35000 --param
| inline-unit-growth=10000 --param
| large-function-growth=200000 -Wno-unused
| -Wunused-result -Wno-unused-parameter -Wno-address
| -std=gnu99 -L/data/seismo82/avinash/Programs/myupc/opt
| -L/data/seismo82/avinash/Programs/myupc/opt/umalloc
| -lupcr-ibv-seq -lumalloc
| -L/data/seismo82/avinash/Programs/myupc/opt/gasnet/ibv-
| conduit -lgasnet-ibv-seq -libverbs -lpthread -lrt
| -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5 -lgcc -lm
----------------------+---------------------------------------------------------
EDIT2：以下是df -h /dev/shm命令的输出
[avinash@range jointinvsurf5_cajoint_compile]$ df -h /dev/shm
Filesystem Size Used Avail Use% Mounted on
tmpfs 126G 21M 126G 1% /dev/shm
默认情况下，Berkeley UPC使用内核共享内存服务来交叉映射位于同一位置的进程之间的UPC共享段。对于smp-conduit，这是唯一的操作模式。
假设这是一个具有配置默认值的Linux系统，最可能的解释是内核提供的POSIX共享内存空间已用尽。您可以通过查看驻留的虚拟文件系统来确认这一点。这是来自配置为最多20G共享内存的系统的示例：
$df -h /dev/shm /var/shm /run/shm
df: '/var/shm': No such file or directory
df: '/run/shm': No such file or directory
Filesystem Size Used Avail Use% Mounted on
tmpfs 20G 504K 20G 1% /dev/shm
此值限制了每个节点共享内存段的总空间。该限制通常可以由管理员调整内核设置来提高，尽管详细信息随发行版而有所不同。
有关更多信息，请参阅https://gasnet.lbl.gov/dist-ex/README中的“ POSIX共享内存的系统设置”部分。
最后，请注意，即使解决了上述问题，在具有256 GB物理DRAM（99.6％）的系统上要求255 GB的共享内存堆也是不可取的。这为应用程序内存的非共享部分（堆栈，静态数据，malloc堆）以及内核和守护进程的内存开销留出了很少的空间。根据您的内核设置，这可能会触发内存不足的恐慌以开始终止进程。我们通常建议将物理内存的安全阈值限制为85％（假设系统否则处于空闲状态），并在此之后“谨慎行事”。
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我来说两句