From 0edb3ddd39ec5ed80cf580148b119d0528875fa9 Mon Sep 17 00:00:00 2001 From: Paul Holzinger Date: Tue, 22 Mar 2022 17:10:43 +0100 Subject: podman stats: calc CPU percentage correctly When you run podman stats, the first interval always shows the wrong cpu usage. To calculate cpu percentage we get the cpu time from the cgroup and compare this against the system time between two stats. Since the first time we do not have a previous stats an empty struct is used instead. Thus we do not use the actual running time of the container but the current unix timestamp (time since Jan 1 1970). To fix this we make sure that the previous stats time is set to the container start time, when it is empty. [NO NEW TESTS NEEDED] No idea how I could create a test which would have a predictable cpu usage. See the linked bugzilla for a reproducer. Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2066145 Signed-off-by: Paul Holzinger --- pkg/api/handlers/compat/containers_stats.go | 2 +- pkg/domain/infra/abi/containers.go | 7 +------ 2 files changed, 2 insertions(+), 7 deletions(-) (limited to 'pkg') diff --git a/pkg/api/handlers/compat/containers_stats.go b/pkg/api/handlers/compat/containers_stats.go index 99f14d02f..77b16b03e 100644 --- a/pkg/api/handlers/compat/containers_stats.go +++ b/pkg/api/handlers/compat/containers_stats.go @@ -56,7 +56,7 @@ func StatsContainer(w http.ResponseWriter, r *http.Request) { return } - stats, err := ctnr.GetContainerStats(&define.ContainerStats{}) + stats, err := ctnr.GetContainerStats(nil) if err != nil { utils.InternalServerError(w, errors.Wrapf(err, "failed to obtain Container %s stats", name)) return diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go index e6feb7c82..1986228a6 100644 --- a/pkg/domain/infra/abi/containers.go +++ b/pkg/domain/infra/abi/containers.go @@ -1431,12 +1431,7 @@ func (ic *ContainerEngine) ContainerStats(ctx context.Context, namesOrIds []stri reportStats := []define.ContainerStats{} for _, ctr := range containers { - prev, ok := containerStats[ctr.ID()] - if !ok { - prev = &define.ContainerStats{} - } - - stats, err := ctr.GetContainerStats(prev) + stats, err := ctr.GetContainerStats(containerStats[ctr.ID()]) if err != nil { cause := errors.Cause(err) if queryAll && (cause == define.ErrCtrRemoved || cause == define.ErrNoSuchCtr || cause == define.ErrCtrStateInvalid) { -- cgit v1.2.3-54-g00ecf