ANALYZE(8) UNIX Programmer's Manual ANALYZE(8) NAME analyze - Virtual UNIX postmortem crash analyzer SYNOPSIS /etc/analyze [ -s swapfile ] [ -f ] [ -m ] [ -d ] [ -D ] [ -v ] corefile [ system ] DESCRIPTION _A_n_a_l_y_z_e is the post-mortem analyzer for the state of the paging system. In order to use _a_n_a_l_y_z_e you must arrange to get a image of the memory (and possibly the paging area) of the system after it crashes (see _c_r_a_s_h(8V)). The _a_n_a_l_y_z_e program reads the relevant system data struc- tures from the core image file and indexing information from /vmunix (or the specified file) to determine the state of the paging subsystem at the point of crash. It looks at each process in the system, and the resources each is using in an attempt to determine inconsistencies in the paging system state. Normally, the output consists of a sequence of lines showing each active process, its state (whether swapped in or not), its _p_0_b_r, and the number and location of its page table pages. Any pages which are locked while raw i/o is in progress, or which are locked because they are _i_n_t_r_a_n_s_i_t are also printed. (Intransit text pages often diagnose as duplicated; you will have to weed these out by hand.) The program checks that any pages in core which are marked as not modified are, in fact, identical to the swap space copies. It also checks for non-overlap of the swap space, and that the core map entries correspond to the page tables. The state of the free list is also checked. Options to _a_n_a_l_y_z_e: -D causes the diskmap for each process to be printed. -d causes the (sorted) paging area usage to be printed. -f which causes the free list to be dumped. -m causes the entire coremap state to be dumped. -v (long unused) which causes a hugely verbose output for- mat to be used. In general, the output from this program can be confused by processes which were forking, swapping, or exiting or hap- pened to be in unusual states when the crash occurred. You should examine the flags fields of relevant processes in the output of a _p_s_t_a_t(8) to weed out such processes. Printed 7/26/87 April 27, 1985 1 ANALYZE(8) UNIX Programmer's Manual ANALYZE(8) It is possible to look at the core dump with _a_d_b if you do adb -k /vmunix /vmcore FILES /vmunix default system namelist SEE ALSO adb(1), ps(1), crash(8V), pstat(8) AUTHORS Ozalp Babaoglu and William Joy DIAGNOSTICS Various diagnostics about overlaps in swap mappings, missing swap mappings, page table entries inconsistent with the core map, incore pages which are marked clean but differ from disk-image copies, pages which are locked or intransit, and inconsistencies in the free list. It would be nice if this program analyzed the system in gen- eral, rather than just the paging system in particular. Printed 7/26/87 April 27, 1985 2