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[14:16:33] I see. Should be simple enough to test whether you're writing on... what, a device ?

[14:22:37] yeah. in particular a block device

[14:23:07] I had support for character devices too but that doesn't perform well

[14:25:09] at least in Linux, block devices have a write-thru cache. character devices appear to have no cache at all, so read perf sucks

[14:27:00] but still I'm wondering why bother with those startup checks at all?

[14:27:20] People were confused by the late error IIRC.

[14:27:29] it's not even checking on WIN32 and generally windows users are the ones who know the least about their computers

[14:28:30] If it causes more trouble than it helps now, feel free to remove tbh.

[14:29:07] And maybe rig the late error to add, eg, " (maybe your fs doesn't mmap)"

[14:29:26] If you can distinguish between errors at that point.

[14:29:51] hm... I'll take a look. at the moment I think all you'll get is mdb_env_open() returns EINVAL

[14:30:09] what FS did someone use that didn't support mmap?

[14:31:02] even NFS claims to support it, however badly

[14:31:53] Some FAT on USB drives I think.

[14:32:20] ok I'll try that

[14:32:21] NFS does ring a bell actually. Maybe grep "mmap nfs" on closed github issues ?

[14:32:47] well. NFS won't refuse the request. it will just perform poorly

[14:34:36] fat32 USB flash drive works fine here

[14:36:02] I wonder if it was exfat or something

[14:41:21] nope. exfat working too

[14:42:26] normal fat32 wouldn't work since it has a 4GB filesize limit

[14:42:39] I mean, it would work until it hit that size limit

[04:22:37] selsta, are you sure, that 7769 and 7770 shouldn't be kept as separate PRs?

[04:23:18] in 7770 it's strictly about Boost, while in 7769 it's about Ubuntu 18.04 with everything else defaulted.

[04:29:36] Also, don't we want to test the minimum advertised Boost version in 7770? Without this test, we'd still think that 1.58 is the minimal version. The same thing can happen to 1.62 in the future, so it'd be good to have it tested. Ccache handles it.

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