Package: doxygen
Version: 1.8.1.2-2
DOT_NUM_THREADS = 0 means autodetect. On bare metal it does make sense
to use more threads than cores, in the assumption than disk will be the
bottleneck.
This can be counterproductive on VMs, I agree.
I suggest you try to force it with DOT_NUM_THREADS = 1; I tried here and
it seems there is only one dot process at a time.
--- System information. ---
Architecture: i386
Kernel: Linux 3.2.0-4-686-pae
Debian Release: 7.1
500 stable-updates mi.mirror.garr.it
500 stable security.debian.org
500 stable mi.mirror.garr.it
--- Package information. ---
Depends(Version) | Installed
-+-==
libc6 (>= 2.3.6-6~) | 2.13-38
libgcc1 (>= 1:4.1.1) | 1:4.7.2-5
libstdc++6(>= 4.1.1) | 4.7.2-5
Recommends (Version) | Installed
-+-===
doxygen-latex| 1.8.1.2-2
Suggests (Version) | Installed
==-+-===
doxygen-doc| 1.8.1.2-2
doxygen-gui| 1.8.1.2-2
graphviz | 2.26.3-14
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