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Commitbd17880

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Introduce GUC shared_memory_size
This runtime-computed GUC shows the size of the server's main sharedmemory area, taking into account the amount of shared memory allocatedby extensions as this is calculated after processingshared_preload_libraries.Author: Nathan BossartDiscussion:https://postgr.es/m/F2772387-CE0F-46BF-B5F1-CC55516EB885@amazon.com
1 parentfd0625c commitbd17880

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5 files changed

+56
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5 files changed

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‎doc/src/sgml/config.sgml

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@@ -10275,6 +10275,20 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
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</listitem>
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</varlistentry>
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<varlistentry id="guc-shared-memory-size" xreflabel="shared_memory_size">
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<term><varname>shared_memory_size</varname> (<type>integer</type>)
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<indexterm>
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<primary><varname>shared_memory_size</varname> configuration parameter</primary>
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</indexterm>
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</term>
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<listitem>
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<para>
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Reports the size of the main shared memory area, rounded up to the
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nearest megabyte.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-ssl-library" xreflabel="ssl_library">
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<term><varname>ssl_library</varname> (<type>string</type>)
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<indexterm>

‎src/backend/postmaster/postmaster.c

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@@ -1026,6 +1026,13 @@ PostmasterMain(int argc, char *argv[])
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*/
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InitializeMaxBackends();
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/*
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* Now that loadable modules have had their chance to request additional
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* shared memory, determine the value of any runtime-computed GUCs that
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* depend on the amount of shared memory required.
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*/
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InitializeShmemGUCs();
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/*
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* Set up shared memory and semaphores.
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*/

‎src/backend/storage/ipc/ipci.c

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@@ -313,3 +313,25 @@ CreateSharedMemoryAndSemaphores(void)
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if (shmem_startup_hook)
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shmem_startup_hook();
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}
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/*
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* InitializeShmemGUCs
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*
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* This function initializes runtime-computed GUCs related to the amount of
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* shared memory required for the current configuration.
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*/
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void
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InitializeShmemGUCs(void)
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{
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charbuf[64];
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Sizesize_b;
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Sizesize_mb;
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/*
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* Calculate the shared memory size and round up to the nearest megabyte.
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*/
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size_b=CalculateShmemSize(NULL);
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size_mb=add_size(size_b, (1024*1024)-1) / (1024*1024);
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sprintf(buf,"%lu",size_mb);
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SetConfigOption("shared_memory_size",buf,PGC_INTERNAL,PGC_S_OVERRIDE);
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}

‎src/backend/utils/misc/guc.c

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@@ -664,6 +664,7 @@ static intmax_index_keys;
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staticintmax_identifier_length;
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staticintblock_size;
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staticintsegment_size;
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staticintshared_memory_size_mb;
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staticintwal_block_size;
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staticbooldata_checksums;
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staticboolinteger_datetimes;
@@ -2337,6 +2338,17 @@ static struct config_int ConfigureNamesInt[] =
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NULL,NULL,NULL
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},
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{
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{"shared_memory_size",PGC_INTERNAL,RESOURCES_MEM,
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gettext_noop("Shows the size of the server's main shared memory area (rounded up to the nearest MB)."),
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NULL,
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GUC_NOT_IN_SAMPLE |GUC_DISALLOW_IN_FILE |GUC_UNIT_MB
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},
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&shared_memory_size_mb,
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0,0,INT_MAX,
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NULL,NULL,NULL
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},
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{
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{"temp_buffers",PGC_USERSET,RESOURCES_MEM,
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gettext_noop("Sets the maximum number of temporary buffers used by each session."),

‎src/include/storage/ipc.h

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@@ -79,5 +79,6 @@ extern PGDLLIMPORT shmem_startup_hook_type shmem_startup_hook;
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externSizeCalculateShmemSize(int*num_semaphores);
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externvoidCreateSharedMemoryAndSemaphores(void);
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externvoidInitializeShmemGUCs(void);
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#endif/* IPC_H */

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