Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-10 Thread Benjamin Kaduk
On Sat, Mar 09, 2019 at 01:49:18AM +0200, Ciprian Dorin Craciun wrote: > On Fri, Mar 8, 2019 at 11:39 PM Ciprian Dorin Craciun > wrote: > > On Fri, Mar 8, 2019 at 11:11 PM Jeffrey Altman wrote: > > > The performance issues could be anywhere and everywhere between the > > > application being used

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Ciprian Dorin Craciun
On Fri, Mar 8, 2019 at 11:39 PM Ciprian Dorin Craciun wrote: > On Fri, Mar 8, 2019 at 11:11 PM Jeffrey Altman wrote: > > The performance issues could be anywhere and everywhere between the > > application being used for testing and the disk backing the vice partition. OK, so first of all I want

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Ciprian Dorin Craciun
[Replying also to the list, just to mention the benchmarking technique.] On Fri, Mar 8, 2019 at 11:11 PM Jeffrey Altman wrote: > The performance issues could be anywhere and everywhere between the > application being used for testing and the disk backing the vice partition. The issue is not th

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Mark Vitale
> On Mar 8, 2019, at 2:38 PM, Ciprian Dorin Craciun > wrote: > > On Fri, Mar 8, 2019 at 9:30 PM Mark Vitale wrote: >> But now on more careful reading, I see this only applies when -dcache has >> not been explicitly specified. >> (Which, to be fair, is the normal case). > > Thanks for the i

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Ciprian Dorin Craciun
On Fri, Mar 8, 2019 at 9:30 PM Mark Vitale wrote: > But now on more careful reading, I see this only applies when -dcache has not > been explicitly specified. > (Which, to be fair, is the normal case). Thanks for the insight. > > (I'm struggling to get AFS to go over the 50MB/s, i.e. half a Gi

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Mark Vitale
Ciprian, > On Mar 8, 2019, at 2:15 PM, Ciprian Dorin Craciun > wrote: > > On Fri, Mar 8, 2019 at 9:11 PM Mark Vitale wrote: >> The -dcache option for a disk-based cache does set the number of dcaches in >> memory. >> It has a minimum value of 2000 and max of 1. > > > Is the 100K maximum

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Mark Vitale
> On Mar 8, 2019, at 11:36 AM, Ciprian Dorin Craciun > wrote: > > On Fri, Mar 8, 2019 at 6:19 PM Ciprian Dorin Craciun > wrote: >> (B) Using `-files` and `-chunksize` so that their product is larger >> than `-blocks` means that the cache can hold up to as many `-files` >> actual AFS files,

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Ciprian Dorin Craciun
On Fri, Mar 8, 2019 at 9:11 PM Mark Vitale wrote: > The -dcache option for a disk-based cache does set the number of dcaches in > memory. > It has a minimum value of 2000 and max of 1. Is the 100K maximum a hard limit imposed in code, or a "best-practice"? (I've looked in a few places and

Re: [OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Mark Vitale
> On Mar 8, 2019, at 11:19 AM, Ciprian Dorin Craciun > wrote: > > I have two small questions about the cache management of `asfd`. (The > documentation isn't very explicit.) > > (In both cases I'm speaking about disk-based cache.) > > (A) Using `-dcache 128` with a `-chunksize 10` (i.e. 1M

[OpenAFS] Questions regarding `afsd` caching arguments (`-dcache` and `-files`)

2019-03-08 Thread Ciprian Dorin Craciun
I have two small questions about the cache management of `asfd`. (The documentation isn't very explicit.) (In both cases I'm speaking about disk-based cache.) (A) Using `-dcache 128` with a `-chunksize 10` (i.e. 1MiB) for a disk-based cache, would actually allocate 128 MiB from kernel memory (i.