== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:14:50 (1786482890)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.43368 s, 16.3 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
llite.lustre-ffff9d768874c000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.844278
Iter 1/10: OSS cache speed: 0.952576
Iter 1/10: ladvise speed: 1.02549
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.876074
Iter 2/10: OSS cache speed: 1.36873
Iter 2/10: ladvise speed: 1.37316
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.09679
Iter 3/10: OSS cache speed: 1.65006
Iter 3/10: ladvise speed: 1.58196
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.56771
Iter 4/10: OSS cache speed: 1.96445
Iter 4/10: ladvise speed: 1.86519
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.60633
Iter 5/10: OSS cache speed: 1.99729
Iter 5/10: ladvise speed: 2.14186
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.17288
Iter 6/10: OSS cache speed: 0.934737
Iter 6/10: ladvise speed: 0.551574
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.50352
Iter 7/10: OSS cache speed: 0.589754
Iter 7/10: ladvise speed: 0.495354
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.57116
Iter 8/10: OSS cache speed: 0.619887
Iter 8/10: ladvise speed: 0.635436
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.674548
Iter 9/10: OSS cache speed: 1.0448
Iter 9/10: ladvise speed: 1.87682
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.16333
Iter 10/10: OSS cache speed: 2.38477
Iter 10/10: ladvise speed: 2.55953
Average uncached read: 1.10
Average speedup with OSS cached read:  1.35 = +22%
Average speedup with ladvise willread:  1.41 = +28%
fail_loc=0