[
https://issues.apache.org/jira/browse/AIRFLOW-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17003745#comment-17003745
]
ASF GitHub Bot commented on AIRFLOW-6361:
-----------------------------------------
mik-laj commented on pull request #6905: [AIRFLOW-6361] Run LocalTaskJob
directly in Celery task
URL: https://github.com/apache/airflow/pull/6905
Hello,
Celery runs the CLI first command, which contains LocalTaskJob. LocalTaskJob
is responsible for starting the next user-code process. This level of isolation
is redundant because LocalTaskJob doesn't execute unsafe code. The first
command is run by a new process creation, not by a fork, so this is an
expensive operation.
According to preliminary measurements, this change results in an increase in
performance close to 30%.
I will provide more information in PR.
Best regards
Kamil Bregula
After:
```
real 0m38.394s
user 0m4.340s
sys 0m1.600s
real 0m38.355s
user 0m4.700s
sys 0m1.340s
real 0m38.675s
user 0m4.760s
sys 0m1.530s
real 0m38.488s
user 0m4.770s
sys 0m1.280s
real 0m38.434s
user 0m4.600s
sys 0m1.390s
real 0m38.378s
user 0m4.500s
sys 0m1.270s
real 0m38.106s
user 0m4.200s
sys 0m1.100s
real 0m38.082s
user 0m4.170s
sys 0m1.030s
real 0m38.173s
user 0m4.290s
sys 0m1.340s
real 0m38.161s
user 0m4.460s
sys 0m1.370s
```
Before:
```
real 0m53.488s
user 0m5.140s
sys 0m1.700s
real 1m8.288s
user 0m6.430s
sys 0m2.200s
real 0m53.371s
user 0m5.330s
sys 0m1.630s
real 0m58.939s
user 0m6.470s
sys 0m1.730s
real 0m53.255s
user 0m4.950s
sys 0m1.640s
real 0m58.802s
user 0m5.970s
sys 0m1.790s
real 0m58.449s
user 0m5.380s
sys 0m1.580s
real 0m53.308s
user 0m5.120s
sys 0m1.430s
real 0m53.485s
user 0m5.220s
sys 0m1.290s
real 0m53.387s
user 0m5.020s
sys 0m1.590s
```
Make sure you have checked _all_ steps below.
### Jira
- [ ] My PR addresses the following [Airflow
Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references
them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
- https://issues.apache.org/jira/browse/AIRFLOW-6361
- In case you are fixing a typo in the documentation you can prepend your
commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
- In case you are proposing a fundamental code change, you need to create
an Airflow Improvement Proposal
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
- In case you are adding a dependency, check if the license complies with
the [ASF 3rd Party License
Policy](https://www.apache.org/legal/resolved.html#category-x).
### Description
- [ ] Here are some details about my PR, including screenshots of any UI
changes:
### Tests
- [ ] My PR adds the following unit tests __OR__ does not need testing for
this extremely good reason:
### Commits
- [ ] My commits all reference Jira issues in their subject lines, and I
have squashed multiple commits if they address the same issue. In addition, my
commits follow the guidelines from "[How to write a good git commit
message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
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1. Subject does not end with a period
1. Subject uses the imperative mood ("add", not "adding")
1. Body wraps at 72 characters
1. Body explains "what" and "why", not "how"
### Documentation
- [ ] In case of new functionality, my PR adds documentation that describes
how to use it.
- All the public functions and the classes in the PR contain docstrings
that explain what it does
- If you implement backwards incompatible changes, please leave a note in
the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so
we can assign it to a appropriate release
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> Run LocalTaskJob directly in Celery task
> ----------------------------------------
>
> Key: AIRFLOW-6361
> URL: https://issues.apache.org/jira/browse/AIRFLOW-6361
> Project: Apache Airflow
> Issue Type: Improvement
> Components: executors
> Affects Versions: 1.10.6
> Reporter: Kamil Bregula
> Priority: Major
> Labels: performance
>
> Hello,
> Celery runs the CLI first command, which contains LocalTaskJob. LocalTaskJob
> is responsible for starting the next user-code process. This level of
> isolation is redundant because LocalTaskJob doesn't execute unsafe code. The
> first command is run by a new process creation, not by a fork, so this is an
> expensive operation.
> According to preliminary measurements, this change results in an increase in
> performance close to 30%.
> I will provide more information in PR.
> Best regards
> Kamil Bregula
> After:
> ```
> real 0m38.394s
> user 0m4.340s
> sys 0m1.600s
> real 0m38.355s
> user 0m4.700s
> sys 0m1.340s
> real 0m38.675s
> user 0m4.760s
> sys 0m1.530s
> real 0m38.488s
> user 0m4.770s
> sys 0m1.280s
> real 0m38.434s
> user 0m4.600s
> sys 0m1.390s
> real 0m38.378s
> user 0m4.500s
> sys 0m1.270s
> real 0m38.106s
> user 0m4.200s
> sys 0m1.100s
> real 0m38.082s
> user 0m4.170s
> sys 0m1.030s
> real 0m38.173s
> user 0m4.290s
> sys 0m1.340s
> real 0m38.161s
> user 0m4.460s
> sys 0m1.370s
> ```
> Before:
> ```
> real 0m53.488s
> user 0m5.140s
> sys 0m1.700s
> real 1m8.288s
> user 0m6.430s
> sys 0m2.200s
> real 0m53.371s
> user 0m5.330s
> sys 0m1.630s
> real 0m58.939s
> user 0m6.470s
> sys 0m1.730s
> real 0m53.255s
> user 0m4.950s
> sys 0m1.640s
> real 0m58.802s
> user 0m5.970s
> sys 0m1.790s
> real 0m58.449s
> user 0m5.380s
> sys 0m1.580s
> real 0m53.308s
> user 0m5.120s
> sys 0m1.430s
> real 0m53.485s
> user 0m5.220s
> sys 0m1.290s
> real 0m53.387s
> user 0m5.020s
> sys 0m1.590s
> ```
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