Re: Very Slow Disk Writes when Writing Large Data Blocks

2017-06-21 Thread remmm
> You'll only reach those numbers in the ideal situation. Is there just one > program doing this disk i/o, sequentially, from a single thread? The IO is sequential write of a stream of very large blocks of data onto a drive that is only say 30% full. So yes you should be able to reach 120 mbytes

Re: Very Slow Disk Writes when Writing Large Data Blocks (Posting On Python-List Prohibited)

2017-06-21 Thread remmm
> Have you tried booting up Linux on the same hardware, and running the same > tests? That would be a good way to narrow down whether the issue is hardware > or software. No just other Linux systems. Hardware in question is corporate system -- so gray area as to if I can or should boot Linux .

Re: Very Slow Disk Writes when Writing Large Data Blocks

2017-06-02 Thread Irmen de Jong
On 2-6-2017 20:14, remmm wrote: > These write speeds are in the range of 18 to 25 MBytes per second for > spinning disks and about 50 Mbytes/sec for SSDs. Keep in mind these numbers > should be more like 120 MBytes/sec for spinning disks and 300 MBytes/sec for > SSDs. You'll only reach thos

Very Slow Disk Writes when Writing Large Data Blocks

2017-06-02 Thread remmm
I'm seeing slow write speeds from both Python and C code on some Windows workstations. In particular both Python "write" and numpy "tofile" method suffers from this issue. I'm wondering if anyone has any ideas regarding if this is a known issue, know the cause, or how to resolve the issue? Th