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write failed%s: %mseek failed
Compare file sync methods using one %dkB write:

Compare file sync methods using two %dkB writes:
(in wal_sync_method preference order, except fdatasync is Linux's default)
open_datasyncfdatasynccould not open output filefsyncfsync failedfsync_writethroughn/aopen_sync* This file system and its mount options do not support direct
  I/O, e.g. ext4 in journaled mode.
pg_test_fsync-12--help-?Usage: %s [-f FILENAME] [-s SECS-PER-TEST]
--version-Vpg_test_fsync (PostgreSQL) 12.21 (Debian 12.21-1.pgdg110+1)Try "%s --help" for more information.
f:s:too many command-line arguments (first is "%s")%d seconds per test
%d second per test
O_DIRECT supported on this platform for open_datasync and open_sync.

Compare open_sync with different write sizes:
(This is designed to compare the cost of writing 16kB in different write
open_sync sizes.)
 1 * 16kB open_sync write 2 *  8kB open_sync writes 4 *  4kB open_sync writes 8 *  2kB open_sync writes16 *  1kB open_sync writes
Test if fsync on non-write file descriptor is honored:
(If the times are similar, fsync() can sync data written on a different
descriptor.)
write, fsync, closewrite, close, fsync
Non-sync'ed %dkB writes:
filenamesecs-per-test./pg_test_fsync.outcould not identify current directory: %mcould not change directory to "%s": %mcould not read symbolic link "%s": %minvalid binary "%s"PATHcould not find a "%s" to executecould not read binary "%s"pclose failed: %m/%s%s"%s" -Vpopen failureno data was returned by command "%s"
fgets failurepostgres-12PGLOCALEDIRPGLOCALEDIR=%sPGSYSCONFDIRPGSYSCONFDIR=%scommand not executablecommand not foundchild process exited with exit code %dchild process was terminated by signal %d: %schild process exited with unrecognized status %dcannot duplicate null pointer (internal error)
PG_COLORalwaysautoPG_COLORSerrorwarninglocus01;3101;3501[%sm%s:%llu:fatal: error: warning: %s
/%s%s/...../../usr/lib/postgresql/12/bin/../%s: out of memory
could not get current working directory: %s
%s/%s/usr/share/postgresql/12/etc/postgresql-common/usr/include/postgresql/usr/include/postgresql/12/server/usr/lib/arm-linux-gnueabihf/usr/lib/postgresql/12/lib/usr/share/locale/usr/share/doc/postgresql-doc-12/usr/share/postgresql/12/manunrecognized signal0123456789abcdef0123456789ABCDEF(null)%pInfinityE2BIGEADDRINUSEEADDRNOTAVAILEAFNOSUPPORTEAGAINEALREADYEBADFEBADMSGEBUSYECHILDECONNABORTEDECONNREFUSEDECONNRESETEDEADLKEDOMEEXISTEFAULTEFBIGEHOSTUNREACHEIDRMEINPROGRESSEINTREINVALEIOEISCONNEISDIRELOOPEMFILEEMLINKEMSGSIZEENAMETOOLONGENFILEENOBUFSENODEVENOENTENOEXECENOMEMENOSPCENOSYSENOTCONNENOTDIRENOTEMPTYENOTSOCKENOTSUPENOTTYENXIOEOVERFLOWEPERMEPIPEEPROTONOSUPPORTERANGEEROFSESRCHETIMEDOUTETXTBSYEXDEVEACCESoperating system error %d:=
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