; core-libs-dev@openjdk.java.net;
nio-...@openjdk.java.net; Thomas Stüfe ; Kaczmarek,
Eric
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
Hi Alan,
Thank you very much for your suggestion. FileStore is a better home for the
alignment value. We will use It in our next version of the
On Sun, Nov 6, 2016 at 6:04 PM, Alan Bateman
wrote:
> On 06/11/2016 15:51, Lu, Yingqi wrote:
>
> Another approach might be use ioctl to get the block size and use that as
> the alignment value. I think ioctl is available on UNIX based OSes (please
> chime in if I miss any OS here) and has a simil
Hi Alan,
Thank you very much for your suggestion. FileStore is a better home for the
alignment value. We will use It in our next version of the patch and update
here for review soon.
Thanks,
Lucy
Sent from my iPhone
On Nov 6, 2016, at 9:04 AM, Alan Bateman
mailto:alan.bate...@oracle.com>> wro
On 06/11/2016 15:51, Lu, Yingqi wrote:
Another approach might be use ioctl to get the block size and use that
as the alignment value. I think ioctl is available on UNIX based OSes
(please chime in if I miss any OS here) and has a similar call for
Windows named DeviceIoControl. The request code
@openjdk.java.net; Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On Sat, Nov 5, 2016 at 6:42 PM, David Holmes
mailto:david.hol...@oracle.com>> wrote:
Hi Paul,
On 5/11/2016 2:58 AM, Paul Sandoz wrote:
Hi Lucy,
I am struggling to find an entirely satisfactory locat
gt;>
>>> From: Paul Sandoz [mailto:paul.san...@oracle.com]
>>> Sent: Thursday, November 03, 2016 12:46 PM
>>> To: Peter Levart
>>> Cc: Lu, Yingqi ; Alan Bateman <
>>> alan.bate...@oracle.com>; nio-...@openjdk.java.net; Kaczmarek, Eric <
>>&g
yd ; Paul Sandoz
>; Lu, Yingqi
>Cc: nio-...@openjdk.java.net; Kaczmarek, Eric ;
>core-libs-dev@openjdk.java.net; Kharbas, Kishor
>Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
>On 04/11/2016 18:32, David M. Lloyd wrote:
>
>> I still feel like it could be
@openjdk.java.net; Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
Hi Peter,
Thanks for pointing this out, you beat me to it :-)
Note that the alignment for a unit size corresponding to page size will only be
stable for direct byte buffers, since for heap byte
On 04/11/2016 18:32, David M. Lloyd wrote:
I still feel like it could be a problem to have just one simple
getPageSize method, given how many CPU architectures and OSes support
multiple page sizes.
Yes.
$ pagesize -a
8192
65536
4194304
268435456
2147483648
--
Alan Burlison
--
e
and consideration!
Thanks,
Lucy
-Original Message-
From: Alan Bateman [mailto:alan.bate...@oracle.com]
Sent: Monday, October 17, 2016 7:59 AM
To: Lu, Yingqi
Cc: nio-...@openjdk.java.net; Kaczmarek, Eric ;
Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On
Eric
>; core-libs-dev@openjdk.java.net; Kharbas, Kishor
>
>Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
>Hi Lucy,
>
>I am struggling to find an entirely satisfactory location to place a method
>such as
>getPageSize, but java.lang.Runtime seems less w
> Cc: Lu, Yingqi ; Alan Bateman ;
> nio-...@openjdk.java.net; Kaczmarek, Eric ;
> core-libs-dev@openjdk.java.net; Kharbas, Kishor
> Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
> Hi Peter,
>
> Thanks for pointing this out, you beat me to it :-)
>
> Note that
gt; 7. We did jtreg test for the entire nio package and no errors were found
>> due to our changes.
>>
>> Please let us know your feedback and comment. Thank you very much for
>> your time and consideration!
>>
>> Thanks,
>> Lucy
>>
>> -Orig
, Yingqi ; Alan Bateman ;
nio-...@openjdk.java.net; Kaczmarek, Eric ;
core-libs-dev@openjdk.java.net; Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
Hi Peter,
Thanks for pointing this out, you beat me to it :-)
Note that the alignment for a unit size corresponding to
back and comment. Thank you very much for your
>> time and consideration!
>>
>> Thanks,
>> Lucy
>>
>>> -Original Message-
>>> From: Alan Bateman [mailto:alan.bate...@oracle.com
>>> <mailto:alan.bate...@oracle.com>]
&g
Lucy
-Original Message-
From: Alan Bateman [mailto:alan.bate...@oracle.com]
Sent: Monday, October 17, 2016 7:59 AM
To: Lu, Yingqi
Cc: nio-...@openjdk.java.net; Kaczmarek, Eric ;
Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On 12/10/2016 17:41, Lu, Yingqi
age-
>From: David M. Lloyd [mailto:david.ll...@redhat.com]
>Sent: Thursday, November 03, 2016 5:15 AM
>To: Lu, Yingqi ; Alan Bateman
>Cc: nio-...@openjdk.java.net; Kharbas, Kishor ;
>core-libs-dev@openjdk.java.net; Kaczmarek, Eric
>Subject: Re: Proposal for adding O_DIRECT suppo
: David M. Lloyd
Cc: Lu, Yingqi ; Alan Bateman ;
nio-...@openjdk.java.net; Kaczmarek, Eric ;
core-libs-dev@openjdk.java.net; Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
Why not call aligned_alloc for doing page alignment? It should waste much less
memory.
http
riginal Message-
From: Alan Bateman [mailto:alan.bate...@oracle.com]
Sent: Monday, October 17, 2016 7:59 AM
To: Lu, Yingqi
Cc: nio-...@openjdk.java.net; Kaczmarek, Eric ;
Kharbas, Kishor
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On 12/10/2016 17:41, Lu, Yingqi wrote:
:
You ar
nio-...@openjdk.java.net; Kaczmarek, Eric ;
>Kharbas, Kishor
>Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
>On 12/10/2016 17:41, Lu, Yingqi wrote:
>
>> :
>>
>> You are correct about the "extra copy" with DirectIO. Will it be acceptable
>>
t: Friday, October 14, 2016 1:28 AM
>To: Lu, Yingqi ; Brian Burkhalter
>
>Cc: Kharbas, Kishor ; nio-...@openjdk.java.net;
>core-libs-dev@openjdk.java.net; Kaczmarek, Eric
>Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
>As has been pointed out already, platforms ot
As has been pointed out already, platforms other than Linux provide
similar functionality, yet this proposal does not provide any support
for them. Even if such support isn't added initially, the APIs added for
the Linux implementation should be generic enough that direct IO support
could be ad
An interesting comparison of approaches on a Linux server and an OS X client is
given here:
http://adityaramesh.com/io_benchmark/
Brian
On Oct 13, 2016, at 3:09 PM, e...@zusammenkunft.net wrote:
> The question is, if support for fadvice() would be more flexible (and
> somewhat saner).
>
> An
t;Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
>On 06/10/2016 00:31, Brian Burkhalter wrote:
>
>> Given that the functionality of O_DIRECT on Linux appears to be
>> supported by other interfaces on OS X, Solaris, and Windows, I wonder
>> whether the patch w
; Kaczmarek, Eric; core-libs-dev@openjdk.java.net;
Kharbas, Kishor
Betreff: Re: Proposal for adding O_DIRECT support into JDK 9
On 06/10/2016 00:31, Brian Burkhalter wrote:
> Given that the functionality of O_DIRECT on Linux appears to be
> supported by other interfaces on OS X, Solaris, and Wind
On 06/10/2016 00:31, Brian Burkhalter wrote:
Given that the functionality of O_DIRECT on Linux appears to be
supported by other interfaces on OS X, Solaris, and Windows, I wonder
whether the patch will need to be refactored in some way to
accommodate these other operating systems? For reference
Hi Lucy,
On Oct 4, 2016, at 5:35 PM, Lu, Yingqi wrote:
> Thank you very much for reviewing the patch and providing the detailed
> error/warning messages. They are very helpful!
You are welcome.
> We will look into the issues and solve them in the next version of the patch.
> Test cases for O
O_DIRECT support into JDK 9
Hi Lucy,
On Oct 4, 2016, at 10:24 AM, Lu, Yingqi
mailto:yingqi...@intel.com>> wrote:
Anyone else has any feedback/comments?
I looked over the 8164900-2 patch and did not see any conceptual problems per
se. I did not however scrutinize all the detailed c
Hi Lucy,
On Oct 4, 2016, at 10:24 AM, Lu, Yingqi wrote:
> Anyone else has any feedback/comments?
I looked over the 8164900-2 patch and did not see any conceptual problems per
se. I did not however scrutinize all the detailed changes, especially the more
extensive ones in FileDispatcherImpl.c
Kaczmarek, Eric
> ; Kharbas, Kishor
> Subject: RE: Proposal for adding O_DIRECT support into JDK 9
>
> Hi All,
>
> Please find the most recent version of the patch available at
> http://cr.openjdk.java.net/~igraves/8164900-2/
>
> In this version, we have following two
Eric ;
> Kharbas, Kishor
> Subject: RE: Proposal for adding O_DIRECT support into JDK 9
>
> Hi All,
>
> Please find the most recent version of the patch available at
> http://cr.openjdk.java.net/~igraves/8164900-2/
>
> In this version, we have following two
; core-libs-dev@openjdk.java.net
Cc: nio-...@openjdk.java.net
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On 26/09/2016 19:50, Lu, Yingqi wrote:
> Alan, you mean readv0/write0 or read0/write0? I just want to make sure
> :-)
Apologies, I meant each of the native methods whe
: nio-...@openjdk.java.net
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
On 26/09/2016 19:50, Lu, Yingqi wrote:
> Alan, you mean readv0/write0 or read0/write0? I just want to make sure
> :-)
Apologies, I meant each of the native methods where the decision to use direct
I/O
On 26/09/2016 19:50, Lu, Yingqi wrote:
Alan, you mean readv0/write0 or read0/write0? I just want to make sure :-)
Apologies, I meant each of the native methods where the decision to use
direct I/O or not would be a lot more maintainable in Java. You'll see
that there are already code paths for
O_DIRECT, we can modify that
for sure.
Thanks,
Lucy
-Original Message-
From: Alan Bateman [mailto:alan.bate...@oracle.com]
Sent: Monday, September 26, 2016 11:42 AM
To: Lu, Yingqi ; core-libs-dev@openjdk.java.net
Cc: nio-...@openjdk.java.net
Subject: Re: Proposal for adding O_DIRECT support
On 26/09/2016 19:17, Lu, Yingqi wrote:
Hi All,
The second version of the patch is now available at
http://cr.openjdk.java.net/~igraves/8164900-1/. In this version, we moved the
O_DIRECT support from FIS/FOS/RAF to FileChannel. We implemented O_DIRECT as a
StandardOpenOption. The reason we d
Message-
From: core-libs-dev [mailto:core-libs-dev-boun...@openjdk.java.net] On Behalf
Of Lu, Yingqi
Sent: Saturday, August 27, 2016 9:01 AM
To: Alan Bateman
Cc: core-libs-dev@openjdk.java.net; Kaczmarek, Eric
Subject: Re: Proposal for adding O_DIRECT support into JDK 9
The workload we have
]
Sent: Sunday, August 28, 2016 3:30 AM
To: 'Andrew Haley' ; Lu, Yingqi ;
core-libs-dev@openjdk.java.net
Cc: Kaczmarek, Eric
Subject: RE: Proposal for adding O_DIRECT support into JDK 9
Hi,
IMHO, I'd stay with FOS/FIS/RAF completely out of this business and not change
them anymore. T
.java.net
> Cc: Kaczmarek, Eric
> Subject: Re: Proposal for adding O_DIRECT support into JDK 9
>
> On 26/08/16 23:31, Lu, Yingqi wrote:
>
> > The proposal adds 4 API methods to java/io/FileInputStream.java,
> > java/io/OutputStream.java to enable the feature. In addition
On 26/08/16 23:31, Lu, Yingqi wrote:
> The proposal adds 4 API methods to java/io/FileInputStream.java,
> java/io/OutputStream.java to enable the feature. In addition, it add
> O_DIRECT with two more modes "ro" (read-only and direct) and "rwo"
> (read-write and direct) to java/io/RandomAccessFile.
ote:
>
>> On 26/08/2016 23:31, Lu, Yingqi wrote:
>>
>> Dear All,
>>
>> This is a proposal for adding O_DIRECT support into JDK 9 for
>> reading/writing from/to a file on Linux platform. O_DIRECT is a file-open
>> flag to pass to OPEN (2). It tries to m
On 26/08/2016 23:31, Lu, Yingqi wrote:
Dear All,
This is a proposal for adding O_DIRECT support into JDK 9 for reading/writing
from/to a file on Linux platform. O_DIRECT is a file-open flag to pass to OPEN
(2). It tries to minimize cache effects of the I/O to and from this file. File
I/O is
Dear All,
This is a proposal for adding O_DIRECT support into JDK 9 for reading/writing
from/to a file on Linux platform. O_DIRECT is a file-open flag to pass to OPEN
(2). It tries to minimize cache effects of the I/O to and from this file. File
I/O is done directly to/from user-space buffers
43 matches
Mail list logo
