global wstat;

probe syscall.write {
    wstat[pid(), execname(), fd] <<< count;
}

probe timer.s(1) {
    printf("%5s %12s %3s %7s %7s\n",
        "PID", "EXECNAME", "FD", "OPS", "KBYTES");

    foreach([pid+, execname, fd] in wstat) {
        printf("%5d %12s %3d %7u %7u\n", 
                    pid, execname, fd, @count(wstat), 
                    @sum(wstat) / 1024);
    }

    delete wstat;
}