== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:47:35 (1787100455)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.9285 s, 7.5 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-ffff96aa0979a000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.359711
Iter 1/10: OSS cache speed: 0.364969
Iter 1/10: ladvise speed: 0.319477
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.310459
Iter 2/10: OSS cache speed: 0.313962
Iter 2/10: ladvise speed: 0.357052
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.415939
Iter 3/10: OSS cache speed: 0.528985
Iter 3/10: ladvise speed: 0.642284
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.625934
Iter 4/10: OSS cache speed: 0.836626
Iter 4/10: ladvise speed: 0.867818
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.10369
Iter 5/10: OSS cache speed: 1.42636
Iter 5/10: ladvise speed: 1.21265
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.985834
Iter 6/10: OSS cache speed: 1.28483
Iter 6/10: ladvise speed: 1.92132
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.39175
Iter 7/10: OSS cache speed: 1.29012
Iter 7/10: ladvise speed: 1.3716
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.09689
Iter 8/10: OSS cache speed: 1.5693
Iter 8/10: ladvise speed: 1.92038
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.68557
Iter 9/10: OSS cache speed: 1.87597
Iter 9/10: ladvise speed: 1.35814
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.38477
Iter 10/10: OSS cache speed: 1.76355
Iter 10/10: ladvise speed: 1.70018
Average uncached read: .93
Average speedup with OSS cached read:  1.12 = +20%
Average speedup with ladvise willread:  1.16 = +24%
fail_loc=0