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Subject: Re: apr_shm_create succeeds then fails on Mac OS X
From: Jim Jagielski <jim@jaguNET.com>
In-Reply-To: <567FEBDF.2020903@gmail.com>
Date: Sun, 27 Dec 2015 16:18:54 -0500
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Message-Id: <5BA8A9B2-FA42-40F7-B101-71E0387DF0C2@jaguNET.com>
References: <DD189592-FCB4-4A99-B95C-F04C2FCB02EE@gmail.com>
 <567FEBDF.2020903@gmail.com>
To: modules-dev@httpd.apache.org

Are you *sure* that /tmp really has enough space?

> On Dec 27, 2015, at 8:47 AM, Sorin Manolache <sorinm@gmail.com> wrote:
>=20
> On 2015-12-25 19:36, Tapple Gao wrote:
>> Hi. I=E2=80=99m trying to get mod_tile working on the builtin apache =
in Mac OS X El Capitan. I am running into a problem with apr_shm_create =
failing to allocate memory during ap_hook_post_config:
>> [Fri Dec 25 12:09:17.898197 2015] [tile:error] [pid 22431] =
Successfully create shared memory segment size 888 on file =
/tmp/httpd_shm.22431
>> [Fri Dec 25 12:09:17.898285 2015] [tile:error] [pid 22431] (12)Cannot =
allocate memory: Failed to create shared memory segment size 2401448 on =
file /tmp/httpd_shm_delay.22431
>>=20
>> Is there something I need to configure to get this shared memory =
working, or increase the limit? This module is most often run on Ubuntu =
linux, where it=E2=80=99s been running for years to power =
openstreetmap.org
>>=20
>>=20
>>     /*
>>      * Create a unique filename using our pid. This information is
>>      * stashed in the global variable so the children inherit it.
>>      * TODO get the location from the environment $TMPDIR or =
somesuch.
>>      */
>>     shmfilename =3D apr_psprintf(pconf, "/tmp/httpd_shm.%ld", (long =
int)getpid());
>>     shmfilename_delaypool =3D apr_psprintf(pconf, =
"/tmp/httpd_shm_delay.%ld", (long int)getpid());
>=20
>=20
> I think that the location of the shmfile must be on a filesystem of a =
special type, namely tmpfs, which maps in memory and not on disk. =
Execute "mount" and check if you have such filesystems mounted. For =
example on my Linux machine:
>=20
> $ mount
> /dev/sda6 on / type ext4 (rw,relatime,errors=3Dremount-ro,data=3Dordered=
)
> tmpfs on /run/shm type tmpfs =
(rw,nosuid,nodev,noexec,relatime,size=3D398160k)
> /dev/sda9 on /tmp type ext4 (rw,relatime,data=3Dordered)
>=20
> As you see, / and /tmp are of disk partitions while /run/shm has a =
filesystem of type tmpfs.
>=20
> I suggest to change the code and use a different location from =
/tmp/... On Linux the shared memory is often created in /run/shm/*. I =
have no experience with Mac OS X.
>=20
> The cleanest way would be to implement what's written in the =
commentary of the code above, namely the possibility to specify the path =
by an evrionment variable or from a configuration directive.
>=20
> Sorin
>=20