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Revise shmget() and semget() failure messages to mention the possibility

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of coping by reducing shared_buffers/max_connections settings.
This commit is contained in:
Tom Lane 2001-10-01 23:26:55 +00:00
parent d7bdfab492
commit c7a7107f41
1 changed files with 46 additions and 19 deletions
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65
src/backend/storage/ipc/ipc.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.70 2001/10/01 18:16:26 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.71 2001/10/01 23:26:55 tgl Exp $
* *
* NOTES * NOTES
* *
@ -299,12 +299,18 @@ InternalIpcSemaphoreCreate(IpcSemaphoreKey semKey,
if (errno == ENOSPC) if (errno == ENOSPC)
fprintf(stderr, fprintf(stderr,
"\nThis error does *not* mean that you have run out of disk space.\n\n" "\nThis error does *not* mean that you have run out of disk space.\n"
"It occurs because either the system limit for the maximum number of\n" "\n"
"It occurs when either the system limit for the maximum number of\n"
"semaphore sets (SEMMNI), or the system wide maximum number of\n" "semaphore sets (SEMMNI), or the system wide maximum number of\n"
"semaphores (SEMMNS), would be exceeded. You need to raise the\n" "semaphores (SEMMNS), would be exceeded. You need to raise the\n"
"respective kernel parameter. Look into the PostgreSQL documentation\n" "respective kernel parameter. Alternatively, reduce PostgreSQL's\n"
"for details.\n\n"); "consumption of semaphores by reducing its max_connections parameter\n"
"(currently %d).\n"
"\n"
"The PostgreSQL Administrator's Guide contains more information about\n"
"configuring your system for PostgreSQL.\n\n",
MaxBackends);
proc_exit(1); proc_exit(1);
} }
@ -583,27 +589,48 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, uint32 size, int permission)
if (errno == EINVAL) if (errno == EINVAL)
fprintf(stderr, fprintf(stderr,
"\nThis error can be caused by one of three things:\n\n" "\nThis error usually means that PostgreSQL's request for a shared memory\n"
"1. The maximum size for shared memory segments on your system was\n" "segment exceeded your kernel's SHMMAX parameter. You can either\n"
" exceeded. You need to raise the SHMMAX parameter in your kernel\n" "reduce the request size or reconfigure the kernel with larger SHMMAX.\n"
" to be at least %u bytes.\n\n" "To reduce the request size (currently %u bytes), reduce\n"
"2. The requested shared memory segment was too small for your system.\n" "PostgreSQL's shared_buffers parameter (currently %d) and/or\n"
" You need to lower the SHMMIN parameter in your kernel.\n\n" "its max_connections parameter (currently %d).\n"
"3. The requested shared memory segment already exists but is of the\n" "\n"
" wrong size. This can occur if some other application on your system\n" "If the request size is already small, it's possible that it is less than\n"
" is also using shared memory.\n\n" "your kernel's SHMMIN parameter, in which case raising the request size or\n"
"reconfiguring SHMMIN is called for.\n"
"\n"
"The PostgreSQL Administrator's Guide contains more information about\n" "The PostgreSQL Administrator's Guide contains more information about\n"
"shared memory configuration.\n\n", "shared memory configuration.\n\n",
size); size, NBuffers, MaxBackends);
else if (errno == ENOMEM)
fprintf(stderr,
"\nThis error usually means that PostgreSQL's request for a shared\n"
"memory segment exceeded available memory or swap space.\n"
"To reduce the request size (currently %u bytes), reduce\n"
"PostgreSQL's shared_buffers parameter (currently %d) and/or\n"
"its max_connections parameter (currently %d).\n"
"\n"
"The PostgreSQL Administrator's Guide contains more information about\n"
"shared memory configuration.\n\n",
size, NBuffers, MaxBackends);
else if (errno == ENOSPC) else if (errno == ENOSPC)
fprintf(stderr, fprintf(stderr,
"\nThis error does *not* mean that you have run out of disk space.\n\n" "\nThis error does *not* mean that you have run out of disk space.\n"
"It occurs either if all available shared memory ids have been taken,\n" "\n"
"It occurs either if all available shared memory IDs have been taken,\n"
"in which case you need to raise the SHMMNI parameter in your kernel,\n" "in which case you need to raise the SHMMNI parameter in your kernel,\n"
"or because the system's overall limit for shared memory has been\n" "or because the system's overall limit for shared memory has been\n"
"reached. The PostgreSQL Administrator's Guide contains more\n" "reached. If you cannot increase the shared memory limit,\n"
"information about shared memory configuration.\n\n"); "reduce PostgreSQL's shared memory request (currently %u bytes),\n"
"by reducing its shared_buffers parameter (currently %d) and/or\n"
"its max_connections parameter (currently %d).\n"
"\n"
"The PostgreSQL Administrator's Guide contains more information about\n"
"shared memory configuration.\n\n",
size, NBuffers, MaxBackends);
proc_exit(1); proc_exit(1);
} }