openssl / openssl/perftools

EVP tests high volatility results

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Dominant language
C
Stars
9
Forks
18
PR merge metrics
No merged PRs in 30d

Description

Some test produce quite volatile results on higher threads count (>= 8). Here is how these results look on charts:

Image Image Image Image

The list of test and commands:

  • evp_cipher -o evp_isolated -a AES-128-CBC -t 16
  • evp_cipher -o evp_isolated -a AES-256-CBC -t 16
  • evp_cipher -o evp_shared -a AES-128-CBC -t 16
  • evp_cipher -o evp_shared -a AES-256-CBC -t 16
  • evp_hash -o evp_isolated -a SHA1 -t 16
  • evp_hash -o evp_isolated -a SHA256 -t 16
  • evp_mac -o evp_isolated -t 16
  • evp_mac -o evp_shared -t 16
  • evp_mac -o deprecated_isolated -t 16
  • evp_mac -o deprecated_shared -t 16
  • providerdoall -t 16
  • x509storeissuer -t 16

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by running the listed evp_cipher, evp_hash, evp_mac, providerdoall, and x509storeissuer commands with 16 threads and compare the results with the reported charts. The issue does not name files or define a fix, so first identify where these EVP tests are implemented and agree on a reproducible criterion for reducing or explaining the volatility.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
performance, testing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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