== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:53:18 (1783140798)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.156 s, 10.3 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-ffff9803cabb6800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.408631
Iter 1/10: OSS cache speed: 0.430971
Iter 1/10: ladvise speed: 0.434727
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.481392
Iter 2/10: OSS cache speed: 0.371301
Iter 2/10: ladvise speed: 0.462539
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.477749
Iter 3/10: OSS cache speed: 0.464331
Iter 3/10: ladvise speed: 0.474262
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.199916
Iter 4/10: OSS cache speed: 0.295017
Iter 4/10: ladvise speed: 0.353284
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.366328
Iter 5/10: OSS cache speed: 0.336939
Iter 5/10: ladvise speed: 0.322494
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.329428
Iter 6/10: OSS cache speed: 0.323801
Iter 6/10: ladvise speed: 0.363025
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.350035
Iter 7/10: OSS cache speed: 0.376765
Iter 7/10: ladvise speed: 0.39336
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.368084
Iter 8/10: OSS cache speed: 0.406593
Iter 8/10: ladvise speed: 0.369088
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.385282
Iter 9/10: OSS cache speed: 0.401968
Iter 9/10: ladvise speed: 0.406044
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.421922
Iter 10/10: OSS cache speed: 0.41272
Iter 10/10: ladvise speed: 0.429343
Average uncached read: .37
Average speedup with OSS cached read:  .38 = +2%
Average speedup with ladvise willread:  .40 = +8%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0