On Tue, Jul 8, 2008 at 14:54, Cai Qian <qcai@xxxxxxxxxx> wrote: > Hi, > > Thanks for all your comments. I have rewritten the tool in C, and made > several changes. The new output is like the following, > > $ /usr/bin/lscpu > CPU(s): 8 > Thread(s) per core: 2 > Core(s) per socket: 2 > CPU socket(s): 2 > NUMA node(s): 1 > Vendor ID: GenuineIntel > CPU family: Itanium 2 > Model: 0 > CPU MHz: 1598.000005 > L1d cache: 16K > L1i cache: 16K > L2d cache: 256K > L2i cache: 1024K > L3 cache: 12288K > > $ /usr/bin/lscpu -p > #The following is the parsable format, which can be fed to other > #programs. Each different item in every column has a unique ID > #starting from zero. > # > #CPU,Core,Socket,Node,L1d,L1i,L2d,L2i,L3 > 0,0,0,0,0,0,0,0,0 > 1,0,0,0,0,0,0,0,0 > 2,1,0,0,1,1,1,0,0 > 3,1,0,0,1,1,1,0,0 > 4,2,1,0,2,2,2,1,1 > 5,2,1,0,2,2,2,1,1 > 6,3,1,0,3,3,3,1,1 > 7,3,1,0,3,3,3,1,1 > > If you are happy about the output. I'll tidy up the code a little bit, > do more testing, and create a manpage. > > Thanks, > CaiQian > > /* > lscpu - CPU architecture information helper > Copyright (C) 2008 Cai Qian <qcai@xxxxxxxxxx> > > This program is free software: you can redistribute it and/or modify > it under the terms of the GNU General Public License as published by > the Free Software Foundation, either version 3 of the License, or > (at your option) any later version. > > This program is distributed in the hope that it will be useful, > but WITHOUT ANY WARRANTY; without even the implied warranty of > MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > GNU General Public License for more details. > > You should have received a copy of the GNU General Public License > along with this program. If not, see <http://www.gnu.org/licenses/>. > */ > > #include <ctype.h> > #include <dirent.h> > #include <err.h> > #include <errno.h> > #include <fcntl.h> > #include <getopt.h> > #include <math.h> > #include <stdio.h> > #include <stdlib.h> > #include <string.h> > #include <sys/stat.h> > #include <sys/types.h> > #include <sys/utsname.h> > #include <unistd.h> > > #define BASE 2 > #define CACHE_MAX 100 > #define MARK_LABEL ":" > > /* Calculate on number of silbings from a decimal mapping. */ > int > sibling (double mapping) > { > int i = 0, j = 0; > > while (mapping != 0) > { > i++; > j = (int) (log (mapping) / log (BASE)); > mapping -= pow (BASE, j); > } > > return i; > } > > /* Convert hexdecimal number from a mapping file to decimal.*/ > double > decimal (char *file) So you extend your supported number of cpus from 32 to 52, great. You should either look inside the kernel code, kernel documentationm or into the libbitmask(3) from Paul Jackson/SGI [1]. > /* number of CPUs */ > for (;;) > { > sprintf (buf, "%s/cpu/cpu%d", syspath, cpu); > if (stat (buf, &info) == 0) > cpu++; > else > break; > } Again, no support for holes in the cpu range. But I'm currently unsure if holes are actually possible. What about using readdir and check for a cpu%d pattern of the dir name with sscanf? > if (have_topology) > { > /* number of threads */ > sprintf (buf, "%s/topology/thread_siblings", cpu0path); > thread = sibling (decimal (buf)); > > /* number of cores */ > sprintf (buf, "%s/topology/core_siblings", cpu0path); > core = sibling (decimal (buf)) / thread; > > /* number of sockets */ > socket = cpu / core / thread; Sockets can also be counted by the physical_package_id topology attribute. But some older architectures have a bug with this [2]. > if (have_node) > { > /* number of NUMA node */ > for (;;) > { > sprintf (buf, "%s/node/node%d", syspath, node); > if (stat (buf, &info) == 0) > node++; > else > break; > } > > /* information about how nodes share different CPUs */ > sprintf (buf, "%s/cpumap", node0path); > nodecpu = sibling (decimal (buf)); What about nodes >0, in node0/cpumap are only the cpus from node0, you should also check the cpumaps from the other nodes. By the way, you check only cpu0 for topology and cache infos, I don't know if it is possible to have cpus of different topology/cache types in one system. Anyone? Regards Bert [1] http://oss.sgi.com/projects/cpusets/ [2] http://lkml.org/lkml/2008/5/13/429 -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
