Date: Sat, 16 Jun 2018 16:03:06 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net>, freebsd-arm@freebsd.org Subject: Re: GPT vs MBR for swap devices Message-ID: <7AB401DF-7AE4-409B-8263-719FD3D889E5@yahoo.com>
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bob prohaska fbsd at www.zefox.net wrote on Sat Jun 16 19:12:22 UTC 2018 (some by reference to other web pages, which is what I quote from here) : > Presently, the divided swap layout fails during -j4 buildworld with > "out of swap" kills during the more frantic portions of buildworld. > > When all swap is placed on a single 3 GB USB mechanical disk partition > the "out of swap" errors go away. Similarly, when swap is placed entirely > on the microSD card in two partitions, one the original 1 GB partition > plus a second 2 GB partition, the "out of swap" errors dissapear. Since the "multiple swap partitions across multiple devices" context (my description) is what has problems, it would be interesting to see swapinfo information from around the time frame of the failures: how much is used vs. available on each swap partition? Is only one being (significantly) used? The small one (1 GiByte)? A related, additional example to try? . . . Since you report needing around 1.2 GiByte of swap, what happens if you have a split but both devices have, say, 1.5 GiByte of swap space for the partition used? If I read right, you could shrink the 2GiByte microSD card partition and the 3 GiByte USB mechanical disk partition and then use that pair as a test. (This also avoids the message about having too much swap. Also, I'm avoiding having significant size differences between the partitions used.) Technically, without the split, either partition should be sufficient without the other involved. In such a context, does the split still fail? Or does it only fail when one partition is stoo small to be sufficient by itself? These suggestions are going a different direction than the I/O rate investigation but also having I/O rate information would not hurt. But I/O rate information can not substitute for the swapinfo output here. Nor can top cover what I'd be looking for: per partition usage figures are required, not just grand total swap-space usage. === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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