This patch allows the module test_perf.py to be run on Windows. It
contains fixes primarily accounting for differences in the
implementation of the multiprocessing module among platforms.
This project is now licensed under the Apache license. Individual files
now have a license reference header.
The Apache 2.0 license text is copied to the file LICENSE. The file
NOTICE, referred to in the license text, has been added. A placeholder
README.txt has been added.
These three new files are integrated into the distribution/installation
machinery, and are placed into the package directory upon installation.
When running in remote server mode (-s), the value of the -s option
specifies which port remote clients must connect to for the job
transmission protocol. The servers for individual suite runs, however,
would be placed at dynamically assigned ports, with port numbers
transmitted to clients through job parameters.
This does not work well when servers sit behind firewalls with restricted
UDP port ranges. This patch introduces the -p option, allowing ports for
server runs to remain fixed at the given port (which, of course, must
not conflict with the port number supplied with -s).
The new module test_perf.py can be used to characterize protocol
performance over a particular network link. Two stream protocols
(TCP and SSL) and two datagram protocols (UDP and DTLS) are available
for relative comparison.
The module will run servers in its process, and will spawn clients either
into separate processes, or, depending on command line options, will
expect one or more remote clients to connect to it. In the latter case,
jobs will be sent to such clients via a shared queue whenever the user
selects a test suite.
Stress testing under packet loss conditions revealed that that the
OpenSSL library's compression feature needed to be explicitly disabled
for DTLS: it evidently operates at the stream layer as opposed to the
datagram layer, and packet loss would result in corruption among the
packets that were successfully received, authenticated, and decrypted.
Several performance improvements are included in this patch.
Ray Brown