Hello all, Please find attached a patch to make wal segment size initdb configurable.
The attached patch removes --with-wal-segsize configure option and adds a new initdb option --wal-segsize. The module initdb passes the wal-segsize value into an environment variable which is used to overwrite the guc value wal_ segment_size and set the internal variables : XLogSegSize and XLOG_SEG_SIZE (xlog_internal.h). The default wal_segment_size is not changed but I have increased the maximum size to 1GB. Since XLOG_SEG_SIZE is now variable, it could not be used directly in src/bin modules and few macros and few changes had to be made: - in guc.c , remove GUC_UNIT_XSEGS which used XLOG_SEG_SIZE and introduce show functions for the guc which used the unit (min_wal_size and max_wal_size). - For pg_basebackup, add new replication command SHOW_WAL_SEGSZ to fetch the wal_segment_size in bytes. - pg_controldata, pg_resetxlog, pg_rewind, fetch the xlog_seg_size from the ControlFile. - Since pg_xlogdump reads the wal files, it uses the file size to determine the xlog_seg_size. - In pg_test_fsync, a buffer of size XLOG_SEG_SIZE was created, filled with random data and written to a temporary file to check for any write/fsync error before performing the tests. Since it does not affect the actual performance results, the XLOG_SEG_SIZE in the module is replaced with the default value (16MB). Please note that the documents are not updated in this patch. Feedback and suggestions are welcome. -- Beena Emerson Have a Great Day!
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