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Remove linear qualification

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Quentin 2022-09-28 15:30:02 +02:00
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content/blog/2022-perf/index.md
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@ -319,8 +319,8 @@ metadata engine and thus focus only on 16-byte objects.
It appears that the performances of our metadata engine are acceptable, as we It appears that the performances of our metadata engine are acceptable, as we
have a comfortable margin compared to Minio (Minio is between 3x and 4x times have a comfortable margin compared to Minio (Minio is between 3x and 4x times
slower per batch). We also note that, past 200k objects, Minio batch slower per batch). We also note that, past 200k objects, Minio batch
completion time is constant as Garage's one remains linear: it could be completion time is constant as Garage's one is still increasing in the observed range:
interesting to know if Garage batch's completion time would cross Minio's one it could be interesting to know if Garage batch's completion time would cross Minio's one
for a very large number of objects. If we reason per object, both Minio and for a very large number of objects. If we reason per object, both Minio and
Garage performances remain very good: it takes respectively around 20ms and Garage performances remain very good: it takes respectively around 20ms and
5ms to create an object. At 100 Mbps, if you upload a 10MB file, the 5ms to create an object. At 100 Mbps, if you upload a 10MB file, the
@ -333,10 +333,11 @@ Next, we focus on Garage's data only to better see its specific behavior:
![Showing the time to send 128 batches of 8192 objects for Garage only](1million.png) ![Showing the time to send 128 batches of 8192 objects for Garage only](1million.png)
Two effects are now more visible: 1. batch completion time is linear with the Two effects are now more visible: 1. increasing batch completion time with the
number of objects in the bucket and 2. measurements are dispersed, at least number of objects in the bucket and 2. measurements are dispersed, at least
more than Minio. We discussed the first point previously but not the second more than Minio. We don't know for sure if this increasing batch completion
one on measurement dispersion. This instability could be an issue as it could time is linear or logarithmic as we don't have enough datapoint; additinal
measurements are needed. Concercning the observed instability, it could
be a symptom of what we saw with some other experiments in this machine: be a symptom of what we saw with some other experiments in this machine:
sometimes it freezes under heavy I/O operations. Such freezes could lead to sometimes it freezes under heavy I/O operations. Such freezes could lead to
request timeouts and failures. If it occurs on our testing computer, it will request timeouts and failures. If it occurs on our testing computer, it will
@ -351,8 +352,8 @@ cluster at [deuxfleurs.fr](https://deuxfleurs) smoothly manages a bucket with
116k objects. This bucket contains real data: it is used by our Matrix instance 116k objects. This bucket contains real data: it is used by our Matrix instance
to store people's media files (profile pictures, shared pictures, videos, to store people's media files (profile pictures, shared pictures, videos,
audios, documents...). Thanks to this benchmark, we have identified two points audios, documents...). Thanks to this benchmark, we have identified two points
of vigilance: putting object duration seems linear with the number of existing of vigilance: batch duration increases with the number of existing
objects in the cluster, and we have some volatility in our measured data that objects in the cluster in the observed range, and we have some volatility in our measured data that
could be a symptom of our system freezing under the load. Despite these two could be a symptom of our system freezing under the load. Despite these two
points, we are confident that Garage could scale way above 1M+ objects, but it points, we are confident that Garage could scale way above 1M+ objects, but it
remains to be proved! remains to be proved!