[202412] [cmis] add read only cache decorator#86
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r12f merged 3 commits intoAzure:202412from Jun 18, 2025
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Defined read only cache decorator after logger setup. Cached return values of static get methods to reduce EEPROM reads. Add unit tests. Signed-off-by: Jianyue Wu <jianyuew@nvidia.com>
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Signed-off-by: Jianyue Wu <jianyuew@nvidia.com>
Signed-off-by: Jianyue Wu <jianyuew@nvidia.com>
r12f
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Jun 18, 2025
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Original PR: sonic-net/sonic-platform-common#562 |
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```<br>* 1ebe56e - (HEAD -> 202503) Merge branch '202412' of https://github.com/Azure/sonic-platform-common.msft into 202503 (2025-06-19) [Sonic Automation] * 6d30299 - (base/202412) [202412] [cmis] add read only cache decorator (#86) (2025-06-18) [Jianyue Wu]<br>```
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202412 Cherry-pick PR for sonic-net/sonic-platform-common#562
Improve CMIS startup performance by adding a read-only cache decorator.
Description
This patch introduces read only cache decorator, which caches the results of static EEPROM-read methods in CmisApi to avoid redundant I2C transactions. By memoizing these methods, we greatly reduce the number of EEPROM reads during startup. Unit tests have been added to verify correct caching behavior and cache invalidation.
Motivation and Context
On systems managing up to 512 CMIS ports, the cumulative cost of repeated EEPROM reads at startup causes noticeable delays. Caching static getter methods eliminates unnecessary I2C calls and speeds up initialization.
How Has This Been Tested?
Test with config reload, speed up around 2 seconds.
Before:
$ time sudo config reload -y Acquired lock on /etc/sonic/reload.lock Disabling container and routeCheck monitoring ... Stopping SONiC target ... Running command: /usr/local/bin/sonic-cfggen -j /etc/sonic/init_cfg.json -j /etc/sonic/config_db.json --write-to-db Running command: /usr/local/bin/db_migrator.py -o migrate Running command: /usr/local/bin/sonic-cfggen -d -y /etc/sonic/sonic_version.yml -t /usr/share/sonic/templates/sonic-environment.j2,/etc/sonic/sonic-environment Restarting SONiC target ... Enabling container and routeCheck monitoring ... Reloading Monit configuration ... Reinitializing monit daemon Released lock on /etc/sonic/reload.lock real 0m22.324s user 0m1.388s sys 0m0.361sAfter:
$ time sudo config reload -y -f Acquired lock on /etc/sonic/reload.lock Disabling container and routeCheck monitoring ... Stopping SONiC target ... Running command: /usr/local/bin/sonic-cfggen -j /etc/sonic/init_cfg.json -j /etc/sonic/config_db.json --write-to-db Running command: /usr/local/bin/db_migrator.py -o migrate Running command: /usr/local/bin/sonic-cfggen -d -y /etc/sonic/sonic_version.yml -t /usr/share/sonic/templates/sonic-environment.j2,/etc/sonic/sonic-environment Restarting SONiC target ... Enabling container and routeCheck monitoring ... Reloading Monit configuration ... Reinitializing monit daemon Released lock on /etc/sonic/reload.lock real 0m20.811s user 0m1.367s sys 0m0.361s