py-pytorch: Update to version 2.9.1

* Update to version 2.9.1
* Add necessary `libunwind` dependency
* Limit jobs for parallel builds

Author: essandess

python/py-pytorch/Portfile

@@ -5,7 +5,7 @@ PortGroup           github 1.0
 PortGroup           mpi 1.0
 PortGroup           python 1.0
 
-github.setup        pytorch pytorch 2.9.0 v
+github.setup        pytorch pytorch 2.9.1 v
 revision            0
 name                py-${github.project}
 license             BSD
@@ -28,9 +28,9 @@ homepage            https://pytorch.org/
 
 distname            pytorch-${github.tag_prefix}${version}
 
-checksums           rmd160  6a7d6c672857538b2ea9666db956b0bc4c438fbb \
-                    sha256  c6980af3c0ea311f49f90987982be715e4d702539fea41e52f55ad7f0b105dc3 \
-                    size    348802387
+checksums           rmd160  ae9ad700158e83a139d39bc2f3df11936fedb524 \
+                    sha256  e17504700ebc4c87f9b57059df1c4d790b769458c04db144c7a92aea90f2c92b \
+                    size    348810776
 
 python.versions     310 311 312 313
 
@@ -105,6 +105,7 @@ if {${name} ne ${subport}} {
         port:gflags \
         port:google-glog \
         port:libomp \
+        port:libunwind \
         port:protobuf3-cpp \
         port:py${python.version}-click \
         port:py${python.version}-future \
@@ -158,7 +159,17 @@ if {${name} ne ${subport}} {
     configure.cppflags-append \
                     -I${prefix}/include/libomp
 
-    configure.ccache    yes
+    configure.ccache    no
+
+    # Limit cores for parallel builds
+    # Note: parallel builds observed to fail on 8, 24 cores
+    use_parallel_build  yes
+    set max_build_jobs  4
+    if {[option build.jobs] < ${max_build_jobs}} {
+        set max_build_jobs  [option build.jobs]
+    }
+    build.env-append \
+                    CMAKE_BUILD_PARALLEL_LEVEL=${max_build_jobs}
 
     build.env-append \
                     CMAKE_LIBRARY_PATH=${prefix}/lib:${prefix}/lib/libomp \