== sanity test 255a: check 'lfs ladvise -a willread' ===== 04:56:56 (1715331416)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 3.77704 s, 27.8 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.0236574
Iter 1/10: OSS cache speed: 0.520419
Iter 1/10: ladvise speed: 0.175202
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.0161477
Iter 2/10: OSS cache speed: 0.229959
Iter 2/10: ladvise speed: 0.115137
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.161841
Iter 3/10: OSS cache speed: 0.901538
Iter 3/10: ladvise speed: 0.468196
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.47839
Iter 4/10: OSS cache speed: 0.455116
Iter 4/10: ladvise speed: 0.150126
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.482078
Iter 5/10: OSS cache speed: 0.157408
Iter 5/10: ladvise speed: 0.186382
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.282713
Iter 6/10: OSS cache speed: 0.0939521
Iter 6/10: ladvise speed: 0.0213539
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.241842
Iter 7/10: OSS cache speed: 0.232253
Iter 7/10: ladvise speed: 0.185526
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.205288
Iter 8/10: OSS cache speed: 0.310424
Iter 8/10: ladvise speed: 0.594285
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.30659
Iter 9/10: OSS cache speed: 1.85468
Iter 9/10: ladvise speed: 1.3569
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.894577
Iter 10/10: OSS cache speed: 1.59185
Iter 10/10: ladvise speed: 1.73102
Average uncached read: .30
Average speedup with OSS cached read: .63 = +110.00%
Average speedup with ladvise willread: .49 = +63.33%
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches
fail_loc=0