ANN: NumExpr 2.7.0 Release

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ANN: NumExpr 2.7.0 Release

Robert McLeod
 Announcing Numexpr 2.7.0

Hi everyone,

This is a minor version bump for NumExpr. We would like to highlight the
made in 2.6.9 (which in retrospect should have been a minor version bump),
the maximum number of threads spawned can be limited by setting the
variable "NUMEXPR_MAX_THREADS". If this variable is not set, in 2.7.0 the
historical limit of 8 threads will be used. The lack of a check caused some
problems on very large hosts in cluster environments in 2.6.9.

In addition, we are officially dropping Python 2.6 support in this release
we cannot perform continuous integration for it.

Project documentation is available at:

Changes from 2.6.9 to 2.7.0

- The default number of 'safe' threads has been restored to the historical
  of 8, if the environment variable "NUMEXPR_MAX_THREADS" has not been set.
- Thanks to @eltoder who fixed a small memory leak.
- Support for Python 2.6 has been dropped, as it is no longer available via
- A typo in the test suite that had a less than rather than greater than
  in the NumPy version check has been corrected thanks to dhomeier.
- The file `site.cfg` was being accidentally included in the sdists on
  It has now been excluded.

What's Numexpr?

Numexpr is a fast numerical expression evaluator for NumPy.  With it,
expressions that operate on arrays (like "3*a+4*b") are accelerated
and use less memory than doing the same calculation in Python.

It has multi-threaded capabilities, as well as support for Intel's
MKL (Math Kernel Library), which allows an extremely fast evaluation
of transcendental functions (sin, cos, tan, exp, log...) while
squeezing the last drop of performance out of your multi-core
processors.  Look here for a some benchmarks of numexpr using MKL:

Its only dependency is NumPy (MKL is optional), so it works well as an
easy-to-deploy, easy-to-use, computational engine for projects that
don't want to adopt other solutions requiring more heavy dependencies.

Where I can find Numexpr?

The project is hosted at GitHub in:

You can get the packages from PyPI as well (but not for RC releases):

Documentation is hosted at:

Share your experience

Let us know of any bugs, suggestions, gripes, kudos, etc. you may

Enjoy data!

Robert McLeod
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