== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:38:06 (1790735886)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.1685 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-ffff974582e9a800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.485279
Iter 1/10: OSS cache speed: 0.522582
Iter 1/10: ladvise speed: 0.570783
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.494936
Iter 2/10: OSS cache speed: 0.524557
Iter 2/10: ladvise speed: 0.553577
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.420574
Iter 3/10: OSS cache speed: 0.438883
Iter 3/10: ladvise speed: 0.515425
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.476093
Iter 4/10: OSS cache speed: 0.554507
Iter 4/10: ladvise speed: 0.543323
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.462191
Iter 5/10: OSS cache speed: 0.444237
Iter 5/10: ladvise speed: 0.478587
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.456389
Iter 6/10: OSS cache speed: 0.456617
Iter 6/10: ladvise speed: 0.451308
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.447768
Iter 7/10: OSS cache speed: 0.428352
Iter 7/10: ladvise speed: 0.448985
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.435861
Iter 8/10: OSS cache speed: 0.538766
Iter 8/10: ladvise speed: 0.502441
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.483138
Iter 9/10: OSS cache speed: 0.485579
Iter 9/10: ladvise speed: 0.551114
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.422263
Iter 10/10: OSS cache speed: 0.495231
Iter 10/10: ladvise speed: 0.563908
Average uncached read: .45
Average speedup with OSS cached read:  .48 = +6%
Average speedup with ladvise willread:  .51 = +13%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0