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Diffstat (limited to 'src/backend/utils/misc/pg_rusage.c')
-rw-r--r--src/backend/utils/misc/pg_rusage.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/backend/utils/misc/pg_rusage.c b/src/backend/utils/misc/pg_rusage.c
new file mode 100644
index 00000000000..a4a6d9e586d
--- /dev/null
+++ b/src/backend/utils/misc/pg_rusage.c
@@ -0,0 +1,75 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_rusage.c
+ * Resource usage measurement support routines.
+ *
+ *
+ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * $PostgreSQL: pgsql/src/backend/utils/misc/pg_rusage.c,v 1.1 2005/10/03 22:52:23 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <unistd.h>
+
+#include "utils/pg_rusage.h"
+
+
+/*
+ * Initialize usage snapshot.
+ */
+void
+pg_rusage_init(PGRUsage *ru0)
+{
+ struct timezone tz;
+
+ getrusage(RUSAGE_SELF, &ru0->ru);
+ gettimeofday(&ru0->tv, &tz);
+}
+
+/*
+ * Compute elapsed time since ru0 usage snapshot, and format into
+ * a displayable string. Result is in a static string, which is
+ * tacky, but no one ever claimed that the Postgres backend is
+ * threadable...
+ */
+const char *
+pg_rusage_show(const PGRUsage *ru0)
+{
+ static char result[100];
+ PGRUsage ru1;
+
+ pg_rusage_init(&ru1);
+
+ if (ru1.tv.tv_usec < ru0->tv.tv_usec)
+ {
+ ru1.tv.tv_sec--;
+ ru1.tv.tv_usec += 1000000;
+ }
+ if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
+ {
+ ru1.ru.ru_stime.tv_sec--;
+ ru1.ru.ru_stime.tv_usec += 1000000;
+ }
+ if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
+ {
+ ru1.ru.ru_utime.tv_sec--;
+ ru1.ru.ru_utime.tv_usec += 1000000;
+ }
+
+ snprintf(result, sizeof(result),
+ "CPU %d.%02ds/%d.%02du sec elapsed %d.%02d sec",
+ (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
+ (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
+ (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
+ (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
+ (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
+ (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
+
+ return result;
+}