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Date: Wed, 25 Jan 2012 10:49:59 +0530 From: Amit Sahrawat <amit.sahrawat83@...il.com> To: xfs@....sgi.com, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@...radead.org>, Dave Chinner <david@...morbit.com> Subject: Does Ext4 support parallel write similar to XFS? In XFS we can write parallel (i.,e we can make use of allocation groups for writing process). If the files are kept in individual directories, there is a possibility that first the blocks for that files be used from individual allocation groups. If I start ‘4’ writing process(cp 100MB_file /<dirnum>/) – after writing is finished – if I check the bmap – it does shows that initial allocation was from individual allocation groups. Even though in Ext4 also we do have groups – but I am not able to get behavior similar to XFS. If I check the file extents – the extents are in mixed form, the allocation pattern is also very fragmented. Please share more on this. Also, if there is a possible exact test case to check for parallel writes support. Thanks & Regards, Amit Sahrawat -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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