== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:39:35 (1784234375)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.8558 s, 17.9 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-ffff9bc258160000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.03113
Iter 1/10: OSS cache speed: 2.08171
Iter 1/10: ladvise speed: 1.95106
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.03508
Iter 2/10: OSS cache speed: 1.98023
Iter 2/10: ladvise speed: 2.01481
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.06821
Iter 3/10: OSS cache speed: 2.04179
Iter 3/10: ladvise speed: 1.96549
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.15215
Iter 4/10: OSS cache speed: 1.93336
Iter 4/10: ladvise speed: 2.05557
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.20377
Iter 5/10: OSS cache speed: 2.07894
Iter 5/10: ladvise speed: 2.12809
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.0816
Iter 6/10: OSS cache speed: 0.810228
Iter 6/10: ladvise speed: 1.07647
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.880264
Iter 7/10: OSS cache speed: 0.521071
Iter 7/10: ladvise speed: 0.416851
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.372725
Iter 8/10: OSS cache speed: 0.42757
Iter 8/10: ladvise speed: 0.470771
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.410463
Iter 9/10: OSS cache speed: 0.340434
Iter 9/10: ladvise speed: 0.419174
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.387076
Iter 10/10: OSS cache speed: 0.333007
Iter 10/10: ladvise speed: 0.374321
Average uncached read: 1.46
Average speedup with OSS cached read:  1.25 = +-14%
Average speedup with ladvise willread:  1.28 = +-12%
Speedup with OSS cached read less than 20%,  got -14%. Skipping ladvise willread check.
fail_loc=0