linux操作系統12-開發(fā)-閱讀頁
2024-10-14 16:22本頁面
【正文】 lename 打印日志消息和其他信息 ? rlog –R只顯示文件名 L 列出被加鎖的文件 l 列出被某個指定用戶加鎖的文件 ? rcsmerge 可以合并多個版本，生成一個單獨的工作文件 ? rcsmerge rAncestor rDescendant Working_file p Merged_file Acegene IT Co. Ltd. 43 基本用法 ? rcs 用于兩種情形： ? 如果以只讀方式取出文件后做修改，并且想保存結果，此時可以使用 rcs l Filename，取出該文件，并加鎖，同時不覆蓋現有的同名文件。 ? 此外： rcs mrev:msg可以修改某個版本的描述信息 Acegene IT Co. Ltd. 44 基本用法 ? rcsclean 清除 RCS文件，基本用法為rcsclean [options] file1 file2 … ?不加任何選項的 rcsclean刪除哪些在取出后沒有更改的工作文件 ? u 選項可以先解鎖所有已經加鎖的文件，然后再刪除沒有更改的那些工作文件。 }。 } Acegene IT Co. Ltd. 49 Glibc Compatibility ? Usually only affected by 2nddigit change –., ? ? Symbols are versioned to provide executable binary patibility ? Does NOT provide link time patibility –Must link against the same version of glibc that objects were piled against –Since Oracle links at the customer site, we get around this by using glibc stubs for linking Acegene IT Co. Ltd. 50 Gcc C++ Compatibility ? C++ ABI has changed between and –C++ on Linux now closer to ISO standard –C++ programs built with will not run with runtime libraries from gcc ? patibility package ??? Acegene IT Co. Ltd. 51 Current Architectures ? These are the CPUs that can run Linux today: –List all CPUs one would need to build for if wanted to send a product on all types of CPUs. –IBM s/390, IA32 –Building for i386 covers most bases w/o optimizations Acegene IT Co. Ltd. 52 Debugging your code ? Spinning process? Oracle shadow? Attach to process using gdb debugger: $ gdb pid 8520 `which oracle` GDB is free software, covered by the GNU General Public Attaching to program: oracle, process 8520 Reading symbols from (gdb) where 0 0x40550104 in semop () from /lib/i686/ 1 0x0981aae9 in sskgpwwait () ? Wait on Semaphore … … … 6 0x0822ed45 in kslwait () 7 0x084fbaf0 in kjudbm () ? Mount Instance (gdb) detach Acegene IT Co. Ltd. 53 Profiling your code ? Is your code doing what you think it should? –To find out or learn more on 3rd party tools, use oprofile, a freeware runtime profiling tool ?Works on UL but not on RHEL –Intel piler: vtune Q U E S T I O N S A N S W E R S
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