Kamil Bregula created AIRFLOW-6361:
--------------------------------------
Summary: 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
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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