Re: [PATCH v2 7/8] maintenance: fix systemd schedule overlaps
From: Junio C Hamano <hidden>
Date: 2023-08-10 21:22:24
"Derrick Stolee via GitGitGadget" [off-list ref] writes:
From: Derrick Stolee <redacted> The 'git maintenance run' command prevents concurrent runs in the same repository using a 'maintenance.lock' file. However, when using systemd the hourly maintenance runs the same time as the daily and weekly runs. (Similarly, daily maintenance runs at the same time as weekly maintenance.) These competing commands result in some maintenance not actually being run. This overlap was something we could not fix until we made the recent change to not use the builting 'hourly', 'daily', and 'weekly' schedules in systemd. We can adjust the schedules such that: 1. Hourly runs avoid the 0th hour. 2. Daily runs avoid Monday.
Simple and stupid is good. When I read the problem description, I wondered if the hour in which daily jobs are run will also be dispersed (so that the load of the server that helps daily tasks at the clients will not be concentrated in a single hour out of 24 hours of a day), but hopefully the load is still spread within that 60 minutes evenly, which probably is good enough.
quoted hunk
This will keep maintenance runs from colliding when using systemd. Signed-off-by: Derrick Stolee <redacted> --- builtin/gc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)diff --git a/builtin/gc.c b/builtin/gc.c index e52129e485c..6f8df366fbe 100644 --- a/builtin/gc.c +++ b/builtin/gc.c@@ -2350,11 +2350,11 @@ static int systemd_timer_write_timer_file(enum schedule_priority schedule, switch (schedule) { case SCHEDULE_HOURLY: - schedule_pattern = xstrfmt("*-*-* *:%02d:00", minute); + schedule_pattern = xstrfmt("*-*-* 1..23:%02d:00", minute); break; case SCHEDULE_DAILY: - schedule_pattern = xstrfmt("*-*-* 0:%02d:00", minute); + schedule_pattern = xstrfmt("Tue..Sun *-*-* 0:%02d:00", minute); break; case SCHEDULE_WEEKLY: