== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:25:40 (1789187140)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.96051 s, 15.1 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-ffff913d0ab49000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.827078
Iter 1/10: OSS cache speed: 1.03117
Iter 1/10: ladvise speed: 1.12713
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.98245
Iter 2/10: OSS cache speed: 1.29153
Iter 2/10: ladvise speed: 1.32099
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.02729
Iter 3/10: OSS cache speed: 1.15863
Iter 3/10: ladvise speed: 1.53
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.976149
Iter 4/10: OSS cache speed: 1.11772
Iter 4/10: ladvise speed: 1.10688
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.26334
Iter 5/10: OSS cache speed: 1.76883
Iter 5/10: ladvise speed: 1.88994
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.48771
Iter 6/10: OSS cache speed: 2.14099
Iter 6/10: ladvise speed: 2.38995
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.39706
Iter 7/10: OSS cache speed: 2.75864
Iter 7/10: ladvise speed: 2.55657
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.50345
Iter 8/10: OSS cache speed: 2.64719
Iter 8/10: ladvise speed: 2.64842
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.49953
Iter 9/10: OSS cache speed: 2.68439
Iter 9/10: ladvise speed: 2.87726
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.33714
Iter 10/10: OSS cache speed: 2.56561
Iter 10/10: ladvise speed: 2.62782
Average uncached read: 1.63
Average speedup with OSS cached read:  1.91 = +17%
Average speedup with ladvise willread:  2.00 = +22%
Speedup with OSS cached read less than 20%,  got 17%. Skipping ladvise willread check.
fail_loc=0