pgbench: Reduce effective cache size

Signed-off-by: Mel Gorman <mgorman@suse.de>
reaim: Fix installed

Signed-off-by: Mel Gorman <mgorman@suse.de>
siege: Run for longer

Signed-off-by: Mel Gorman <mgorman@suse.de>
siege: Use coarse-grained clock instead of clock()

Reschedules disrupt timings.

Signed-off-by: Mel Gorman <mgorman@suse.de>
siege: Define CLOCK_REALTIME_COARSE if not defined already

Happens if there is an older verison of glibc headers.

Signed-off-by: Mel Gorman <mgorman@suse.de>
siege: Unconditionally use -lrt for older glibc

Signed-off-by: Mel Gorman <mgorman@suse.de>