| Re: what is the purpose of -Dxt3 in the makefile? ( No.1 )|
- Date: 2017/06/01 11:17
- Name: T. Ozaki
It was found in some IO systems that saving small amount of data frequently degrades
the performance (i.e., IO speed) significantly. To reduce the frequency of IO access,
setvbuf can be utilized very effectively. Please take a look at
In fact, we found that the performance can be improved in such systems.
| Re: what is the purpose of -Dxt3 in the makefile? [SOLVED] ( No.2 )|
- Date: 2017/06/01 19:44
- Name: Chris Latham
That's very helpful, thanks. I understand now.
It would probably be worth including a few words about this in the official installation instructions (I cannot find anything but may have missed it).
On systems with Linux kernel from 2.6.13 (or 2.6.26 for finer control) it is also possible to set, modify, and examine I/O scheduling with the ionice command (e.g. for low priority use "ionice -c 3 _command_"). See "man ionice" for details.
Many thanks again,