== sanity test 255a: check 'lfs ladvise -a willread' ===== 02:19:00 (1769757540)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.7283 s, 7.1 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-ffff8d1546298800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.386769
Iter 1/10: OSS cache speed: 0.390804
Iter 1/10: ladvise speed: 0.424513
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.42574
Iter 2/10: OSS cache speed: 0.479029
Iter 2/10: ladvise speed: 0.527081
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.536895
Iter 3/10: OSS cache speed: 0.544574
Iter 3/10: ladvise speed: 0.570795
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.549308
Iter 4/10: OSS cache speed: 0.585644
Iter 4/10: ladvise speed: 0.61834
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.569553
Iter 5/10: OSS cache speed: 0.601902
Iter 5/10: ladvise speed: 0.632384
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.590403
Iter 6/10: OSS cache speed: 0.682614
Iter 6/10: ladvise speed: 0.60397
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.514391
Iter 7/10: OSS cache speed: 0.567701
Iter 7/10: ladvise speed: 0.666603
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.609977
Iter 8/10: OSS cache speed: 0.65041
Iter 8/10: ladvise speed: 0.713771
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.644014
Iter 9/10: OSS cache speed: 0.73716
Iter 9/10: ladvise speed: 0.861418
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.834216
Iter 10/10: OSS cache speed: 0.998009
Iter 10/10: ladvise speed: 1.2234
Average uncached read: .56
Average speedup with OSS cached read:  .62 = +10%
Average speedup with ladvise willread:  .68 = +21%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0