Thread pool limited to 16 threads on 48 core machine

It seems that FL is unable to use more than 16 threads in the thread pool to perform computations. Some potentially useful information, !CPU gives

{
    "HW_VECTOR": 1,
    "VECTOR_ENABLE": 1,
    "HW_NCPU": 16,
    "TPOOL_NTHREADS": 16,
    "TPOOL_MIN_ELTS": 100000,
    "TPOOL_MAX_ELTS": 0
}

although the machine has two hyperthreaded 12-core CPUs (so, 2 12-core chips giving 24 real cores and 48 virtual cores). The output of lscpu on this system gives:

#!

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                48
On-line CPU(s) list:   0-47
Thread(s) per core:    2
Core(s) per socket:    12
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Model name:            Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz
Stepping:              2
CPU MHz:               2174.128
BogoMIPS:              4604.26
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              30720K
NUMA node0 CPU(s):     0-11,24-35
NUMA node1 CPU(s):     12-23,36-47

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