== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:17:17 (1746073037)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 4.30854 s, 24.3 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-ffff8800b3a30000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.868244
Iter 1/10: OSS cache speed: 0.80413
Iter 1/10: ladvise speed: 0.724929
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.701009
Iter 2/10: OSS cache speed: 0.833066
Iter 2/10: ladvise speed: 0.788566
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.853239
Iter 3/10: OSS cache speed: 0.760045
Iter 3/10: ladvise speed: 0.75928
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.809415
Iter 4/10: OSS cache speed: 0.813639
Iter 4/10: ladvise speed: 0.886029
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.97357
Iter 5/10: OSS cache speed: 0.884832
Iter 5/10: ladvise speed: 0.987512
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.941143
Iter 6/10: OSS cache speed: 0.978007
Iter 6/10: ladvise speed: 0.853378
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.856221
Iter 7/10: OSS cache speed: 1.00649
Iter 7/10: ladvise speed: 0.9119
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.992908
Iter 8/10: OSS cache speed: 1.17721
Iter 8/10: ladvise speed: 1.22862
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.07534
Iter 9/10: OSS cache speed: 0.75012
Iter 9/10: ladvise speed: 1.04883
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.05062
Iter 10/10: OSS cache speed: 0.993787
Iter 10/10: ladvise speed: 0.941568
Average uncached read: .91
Average speedup with OSS cached read:  .90 = +-1%
Average speedup with ladvise willread:  .91 = +0%
Speedup with OSS cached read less than 20%,  got -1%. Skipping ladvise willread check.
fail_loc=0