== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:18:59 (1744085939)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.61022 s, 40.2 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-ffff8800ae824000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.36741
Iter 1/10: OSS cache speed: 2.14386
Iter 1/10: ladvise speed: 2.34678
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.98374
Iter 2/10: OSS cache speed: 2.058
Iter 2/10: ladvise speed: 2.81873
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.84684
Iter 3/10: OSS cache speed: 2.34525
Iter 3/10: ladvise speed: 2.21727
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.49554
Iter 4/10: OSS cache speed: 3.16427
Iter 4/10: ladvise speed: 2.83778
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.27896
Iter 5/10: OSS cache speed: 2.9675
Iter 5/10: ladvise speed: 3.09923
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.03
Iter 6/10: OSS cache speed: 2.21954
Iter 6/10: ladvise speed: 1.8415
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.0581
Iter 7/10: OSS cache speed: 2.86101
Iter 7/10: ladvise speed: 1.68482
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.33917
Iter 8/10: OSS cache speed: 1.68449
Iter 8/10: ladvise speed: 1.95921
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.25279
Iter 9/10: OSS cache speed: 2.64764
Iter 9/10: ladvise speed: 2.53722
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.30473
Iter 10/10: OSS cache speed: 1.88494
Iter 10/10: ladvise speed: 1.86467
Average uncached read: 2.19
Average speedup with OSS cached read:  2.39 = +9%
Average speedup with ladvise willread:  2.32 = +5%
Speedup with OSS cached read less than 20%,  got 9%. Skipping ladvise willread check.
fail_loc=0