I am wondering, if and how gzip is used for compression/decompression. Is it always used? Is it always used with a fixed compression level?
The hdf5 gzip compression/decompression is only used if the exodus output is being sent to a netcdf-4 based exodus/netcdf file.
This is selected if the file is created with EX_NETCDF4 mode. You can then make calls to ex_set_option(). The argument EX_OPT_COMPRESSION_LEVEL ranges from 0 (disabled) to 9 (best/slowest). I have found 1 or 2 seems to work best. You can also set EX_OPT_COMPRESSION_SHUFFLE to 1 which enables that on top of the compression and seems to help quite a bit.
On read, it wil all be handled transparently.
From: kassbohm firstname.lastname@example.org<mailto:email@example.com>
Reply-To: "[exodusii:discussion]" firstname.lastname@example.org<mailto:email@example.com>
Date: Friday, September 27, 2013 12:05 AM
To: "[exodusii:discussion]" firstname.lastname@example.org<mailto:email@example.com>
Subject: [EXTERNAL] [exodusii:discussion] gzip compression
Sent from sourceforge.net because you indicated interest in https://sourceforge.net/p/exodusii/discussion/491441/
To unsubscribe from further messages, please visit https://sourceforge.net/auth/subscriptions/
Sign up for the SourceForge newsletter:
You seem to have CSS turned off.
Please don't fill out this field.