From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?unknown-8bit?q?=C3=93scar?= Fuentes Date: Sun, 28 Sep 2008 20:22:50 +0000 Subject: [lm-sensors] Does this makes any sense? Message-Id: <4p40uijp.fsf@telefonica.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: lm-sensors@vger.kernel.org This is not a problem with lm-sensors, but an attempt to understand what can cause the values it outputs. When I start four mprime processes in "torture test" mode on a Q6600 system it shows a flat 100% CPU usage line and `sensors` report temperatures around or below 70 degrees Celsius for each core, which is consistent with Intel's specs for a fully loaded CPU: oscar@qcore:~/Archivo/prime$ sensors coretemp-isa-0000 Adapter: ISA adapter Core 0: +73.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +71.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0002 Adapter: ISA adapter Core 2: +62.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0003 Adapter: ISA adapter Core 3: +58.0=B0C (crit =3D +100.0=B0C) However, when compiling an application with "make -j 4" the CPU usage is around 95% (which is expected as there is quite a bit of I/O involved) but the temperature goes up to 88 degrees on some cores! This is a typical output of `sensors` on this scenario: coretemp-isa-0000 =20 Adapter: ISA adapter =20 Core 0: +85.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +82.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0002 Adapter: ISA adapter Core 2: +71.0=B0C (crit =3D +100.0=B0C) coretemp-isa-0003 Adapter: ISA adapter Core 3: +65.0=B0C (crit =3D +100.0=B0C) What can cause this difference on temperatures, when mprime stresses the CPU much more than the compiler? --=20 Oscar _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors