== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:14:20 (1788815660)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.14074 s, 17.1 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-ffff9853469bc000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.657203
Iter 1/10: OSS cache speed: 0.776373
Iter 1/10: ladvise speed: 0.901109
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.664918
Iter 2/10: OSS cache speed: 0.261149
Iter 2/10: ladvise speed: 0.50433
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.520559
Iter 3/10: OSS cache speed: 0.557943
Iter 3/10: ladvise speed: 0.503464
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.465886
Iter 4/10: OSS cache speed: 0.537095
Iter 4/10: ladvise speed: 0.5107
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.528343
Iter 5/10: OSS cache speed: 0.575705
Iter 5/10: ladvise speed: 0.717793
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.580717
Iter 6/10: OSS cache speed: 0.637039
Iter 6/10: ladvise speed: 0.689426
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.639833
Iter 7/10: OSS cache speed: 0.729562
Iter 7/10: ladvise speed: 0.749789
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.705601
Iter 8/10: OSS cache speed: 0.807198
Iter 8/10: ladvise speed: 0.795162
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.294487
Iter 9/10: OSS cache speed: 0.533882
Iter 9/10: ladvise speed: 0.53909
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.484309
Iter 10/10: OSS cache speed: 0.506565
Iter 10/10: ladvise speed: 0.453463
Average uncached read: .55
Average speedup with OSS cached read:  .59 = +7%
Average speedup with ladvise willread:  .63 = +14%
Speedup with OSS cached read less than 20%,  got 7%. Skipping ladvise willread check.
fail_loc=0