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Updates to docs/Multithreading.md.

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Details:
- Made extra explicit the fact that: (a) multithreading in BLIS is
  disabled by default; and (b) even with multithreading enabled, the
  user must specify multithreading at runtime in order to observe
  parallelism. Thanks to M. Zhou for suggesting these clarifications
  in #292.
- Also made explicit that only the environment variable and global
  runtime API methods are available when using the BLAS API. If the
  user wishes to use the local runtime API (specify multithreading on
  a per-call basis), one of the native BLIS APIs must be used.
This commit is contained in:
Field G. Van Zee
2019-03-18 13:22:55 -05:00
committed by dzambare
parent ecf05352f2
commit 5904e18d40
1 changed files with 6 additions and 0 deletions
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docs/Multithreading.md
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@@ -31,6 +31,12 @@ To summarize: In order to observe multithreaded parallelism within a BLIS operat
1. Enable multithreading at configure-time. This is discussed in the [next section](docs/Multithreading.md#enabling-multithreading).
2. Specify multithreading at runtime. This is also discussed [later on](docs/Multithreading.md#specifying-multithreading).
**IMPORTANT**: Multithreading in BLIS is disabled by default. Furthermore, even when multithreading is enabled, BLIS will default to single-threaded execution at runtime. In order to both *allow* and *invoke* parallelism from within BLIS operations, you must both *enable* multithreading at configure-time and *specify* multithreading at runtime.
To summarize: In order to observe multithreaded parallelism within a BLIS operation, you must do *both* of the following:
1. Enable multithreading at configure-time. This is discussed in the [next section](docs/Multithreading.md#enabling-multithreading).
2. Specify multithreading at runtime. This is also dicussed [later on](docs/Multithreading.md#specifying-multithreading).
# Enabling multithreading
BLIS disables multithreading by default. In order to allow multithreaded parallelism from BLIS, you must first enable multithreading explicitly at configure-time.