Deprecate use of parallel easyconfig parameter and fix updating the template value

easybuild/framework/easyblock.py

@@ -340,6 +340,7 @@ def post_init(self):
             # but needs to be correct if the build is performed in the installation directory
             self.log.info("Changing build dir to %s", self.installdir)
             self.builddir = self.installdir
+        self.set_parallel()
 
     # INIT/CLOSE LOG
     def _init_log(self):
@@ -1978,7 +1979,7 @@ def skip_extensions_parallel(self, exts_filter):
         exts_cnt = len(self.ext_instances)
         cmds = [resolve_exts_filter_template(exts_filter, ext) for ext in self.ext_instances]
 
-        with ThreadPoolExecutor(max_workers=self.cfg['parallel']) as thread_pool:
+        with ThreadPoolExecutor(max_workers=self.cfg.parallel) as thread_pool:
 
             # list of command to run asynchronously
             async_cmds = [thread_pool.submit(run_shell_cmd, cmd, stdin=stdin, hidden=True, fail_on_error=False,
@@ -2108,7 +2109,7 @@ def install_extensions_parallel(self, install=True):
         """
         self.log.info("Installing extensions in parallel...")
 
-        thread_pool = ThreadPoolExecutor(max_workers=self.cfg['parallel'])
+        thread_pool = ThreadPoolExecutor(max_workers=self.cfg.parallel)
 
         running_exts = []
         installed_ext_names = []
@@ -2170,7 +2171,7 @@ def update_exts_progress_bar_helper(running_exts, progress_size):
 
             for _ in range(max_iter):
 
-                if not (exts_queue and len(running_exts) < self.cfg['parallel']):
+                if not (exts_queue and len(running_exts) < self.cfg.parallel):
                     break
 
                 # check whether extension at top of the queue is ready to install
@@ -2409,19 +2410,22 @@ def set_parallel(self):
         """Set 'parallel' easyconfig parameter to determine how many cores can/should be used for parallel builds."""
         # set level of parallelism for build
         par = build_option('parallel')
-        cfg_par = self.cfg['parallel']
-        if cfg_par is None:
+        if par is not None:
             self.log.debug("Desired parallelism specified via 'parallel' build option: %s", par)
-        elif par is None:
-            par = cfg_par
-            self.log.debug("Desired parallelism specified via 'parallel' easyconfig parameter: %s", par)
-        else:
-            par = min(int(par), int(cfg_par))
-            self.log.debug("Desired parallelism: minimum of 'parallel' build option/easyconfig parameter: %s", par)
 
-        par = det_parallelism(par, maxpar=self.cfg['maxparallel'])
+        # Transitional only in case some easyblocks still set/change cfg['parallel']
+        # Use _parallelLegacy to avoid deprecation warnings
+        # Remove for EasyBuild 5.1
+        cfg_par = self.cfg['_parallelLegacy']
+        if cfg_par is not None:
+            if par is None:
+                par = cfg_par
+            else:
+                par = min(int(par), int(cfg_par))
+
+        par = det_parallelism(par, maxpar=self.cfg['max_parallel'])
         self.log.info("Setting parallelism: %s" % par)
-        self.cfg['parallel'] = par
+        self.cfg.parallel = par
 
     def remove_module_file(self):
         """Remove module file (if it exists), and check for ghost installation directory (and deal with it)."""
@@ -2467,8 +2471,6 @@ def check_readiness_step(self):
         """
         Verify if all is ok to start build.
         """
-        self.set_parallel()
-
         # check whether modules are loaded
         loadedmods = self.modules_tool.loaded_modules()
         if len(loadedmods) > 0:

easybuild/framework/easyconfig/default.py

@@ -110,8 +110,6 @@
     'installopts': ['', 'Extra options for installation', BUILD],
     'maxparallel': [16, 'Max degree of parallelism', BUILD],
     'module_only': [False, 'Only generate module file', BUILD],
-    'parallel': [None, ('Degree of parallelism for e.g. make (default: based on the number of '
-                        'cores, active cpuset and restrictions in ulimit)'), BUILD],
     'patches': [[], "List of patches to apply", BUILD],
     'prebuildopts': ['', 'Extra options pre-passed to build command.', BUILD],
     'preconfigopts': ['', 'Extra options pre-passed to configure.', BUILD],

easybuild/framework/easyconfig/easyconfig.py

@@ -120,7 +120,17 @@ def handle_deprecated_or_replaced_easyconfig_parameters(ec_method):
     def new_ec_method(self, key, *args, **kwargs):
         """Check whether any replace easyconfig parameters are still used"""
         # map deprecated parameters to their replacements, issue deprecation warning(/error)
-        if key in ALTERNATIVE_EASYCONFIG_PARAMETERS:
+        if key == 'parallel':
+            _log.deprecated("Easyconfig parameter 'parallel' is deprecated, "
+                            "use 'max_parallel' or the parallel property instead.", '5.1')
+            # This "hidden" property allows easyblocks to continue using ec['parallel'] which contains
+            # the computed parallelism after the ready step but the EC parameter before that step.
+            # Easyblocks using `max_parallel` always get the value from the EC unmodified.
+            # Easyblocks should use either the parallel property or `max_parallel` such that the semantic is clear.
+            # In particular writes to ec['parallel'] do NOT update the %(parallel)s template.
+            # It can be removed when the deprecation expires.
+            key = '_parallelLegacy'
+        elif key in ALTERNATIVE_EASYCONFIG_PARAMETERS:
             key = ALTERNATIVE_EASYCONFIG_PARAMETERS[key]
         elif key in DEPRECATED_EASYCONFIG_PARAMETERS:
             depr_key = key
@@ -144,7 +154,9 @@ def is_local_var_name(name):
     """
     res = False
     if name.startswith(LOCAL_VAR_PREFIX) or name.startswith('_'):
-        res = True
+        # Remove with EasyBuild 5.1
+        if name != '_parallelLegacy':
+            res = True
     # __builtins__ is always defined as a 'local' variables
     # single-letter local variable names are allowed (mainly for use in list comprehensions)
     # in Python 2, variables defined in list comprehensions leak to the outside (no longer the case in Python 3)
@@ -502,6 +514,11 @@ def __init__(self, path, extra_options=None, build_specs=None, validate=True, hi
         self.iterate_options = []
         self.iterating = False
 
+        # Storage for parallel property. Mark as unset initially
+        self._parallel = None
+        # Legacy value, remove with EasyBuild 5.1
+        self._config['_parallelLegacy'] = [None, '', ('', )]
+
         # parse easyconfig file
         self.build_specs = build_specs
         self.parse()
@@ -598,6 +615,7 @@ def copy(self, validate=None):
         ec = EasyConfig(self.path, validate=validate, hidden=self.hidden, rawtxt=self.rawtxt)
         # take a copy of the actual config dictionary (which already contains the extra options)
         ec._config = copy.deepcopy(self._config)
+        ec._parallel = self._parallel  # Might be already set, e.g. for extensions
         # since rawtxt is defined, self.path may not get inherited, make sure it does
         if self.path:
             ec.path = self.path
@@ -702,6 +720,11 @@ def parse(self):
         if missing_mandatory_keys:
             raise EasyBuildError("mandatory parameters not provided in %s: %s", self.path, missing_mandatory_keys)
 
+        if 'parallel' in ec_vars:
+            # Replace value and issue better warning for EC params (as opposed to warnings meant for easyblocks)
+            self.log.deprecated("Easyconfig parameter 'parallel' is deprecated, use 'max_parallel' instead.", '5.1')
+            ec_vars['_parallelLegacy'] = ec_vars.pop('parallel')
+
         # provide suggestions for typos. Local variable names are excluded from this check
         possible_typos = [(key, difflib.get_close_matches(key.lower(), self._config.keys(), 1, 0.85))
                           for key in ec_vars if not is_local_var_name(key) and key not in self]
@@ -1235,6 +1258,31 @@ def all_dependencies(self):
 
         return self._all_dependencies
 
+    @property
+    def is_parallel_set(self):
+        """Return if the desired parallelism has been determined yet"""
+        return self._parallel is not None
+
+    @property
+    def parallel(self):
+        """Number of parallel jobs to be used for building etc."""
+        if self._parallel is None:
+            raise ValueError("Parallelism in EasyConfig not set yet. Need to call the easyblocks set_parallel first.")
+        # This gets set when an easyblock changes ec['parallel'].
+        # It also gets set/updated in set_parallel to mirror the old behavior during the deprecation phase
+        parallelLegacy = self._config['_parallelLegacy'][0]
+        if parallelLegacy is not None:
+            return max(1, parallelLegacy)
+        return self._parallel
+
+    @parallel.setter
+    def parallel(self, value):
+        # Update backstorage and template value
+        self._parallel = max(1, value)  # Also handles False
+        self.template_values['parallel'] = self._parallel
+        # Backwards compat only for easyblocks reading ec['parallel']. Remove with EasyBuild 5.1
+        self._config['_parallelLegacy'][0] = self._parallel
+
     def dump(self, fp, always_overwrite=True, backup=False, explicit_toolchains=False):
         """
         Dump this easyconfig to file, with the given filename.

easybuild/framework/easyconfig/format/format.py

@@ -68,7 +68,7 @@
     ['preconfigopts', 'configopts'],
     ['prebuildopts', 'buildopts'],
     ['preinstallopts', 'installopts'],
-    ['parallel', 'maxparallel'],
+    ['maxparallel'],
 ]
 LAST_PARAMS = ['exts_default_options', 'exts_list',
                'sanity_check_paths', 'sanity_check_commands',

easybuild/framework/easyconfig/templates.py

@@ -59,7 +59,6 @@
     'bitbucket_account',
     'github_account',
     'name',
-    'parallel',
     'version',
     'versionsuffix',
     'versionprefix',
@@ -108,7 +107,7 @@
     'software_commit': "Git commit id to use for the software as specified by --software-commit command line option",
     'sysroot': "Location root directory of system, prefix for standard paths like /usr/lib and /usr/include"
                "as specify by the --sysroot configuration option",
-
+    'parallel': "Degree of parallelism for e.g. make",
 }
 
 # constant templates that can be used in easyconfigs

easybuild/framework/extension.py

@@ -132,6 +132,10 @@ def __init__(self, mself, ext, extra_params=None):
         self.options = resolve_template(copy.deepcopy(self.ext.get('options', {})),
                                         self.cfg.template_values,
                                         expect_resolved=False)
+        if 'parallel' in self.options:
+            # Replace value and issue better warning for EC params (as opposed to warnings meant for easyblocks)
+            self.log.deprecated("Easyconfig parameter 'parallel' is deprecated, use 'max_parallel' instead.", '5.1')
+            self.options['max_parallel'] = self.options.pop('parallel')
 
         if extra_params:
             self.cfg.extend_params(extra_params, overwrite=False)
@@ -149,6 +153,12 @@ def __init__(self, mself, ext, extra_params=None):
                 self.log.debug("Skipping unknown custom easyconfig parameter '%s' for extension %s/%s: %s",
                                key, name, version, value)
 
+        # If parallelism has been set already take potentially new limitation into account
+        if self.cfg.is_parallel_set:
+            max_par = self.cfg['max_parallel']
+            if max_par is not None and max_par < self.cfg.parallel:
+                self.cfg.parallel = max_par
+
         self.sanity_check_fail_msgs = []
         self.sanity_check_module_loaded = False
         self.fake_mod_data = None

easybuild/scripts/mk_tmpl_easyblock_for.py

@@ -165,7 +165,7 @@ def build_step(self):
         comp_fam = comp_map[self.toolchain.comp_family()]
 
         # enable parallel build
-        par = self.cfg['parallel']
+        par = self.cfg.parallel
         cmd = "build command --parallel %%d --compiler-family %%s" %% (par, comp_fam)
         run_shell_cmd(cmd)
 

easybuild/tools/systemtools.py

@@ -1214,6 +1214,8 @@ def get_default_parallelism():
             raise EasyBuildError("Specified level of parallelism '%s' is not an integer value: %s", par, err)
 
     if maxpar is not None and maxpar < par:
+        if maxpar is False:
+            maxpar = 1
         _log.info("Limiting parallelism from %s to %s", par, maxpar)
         par = maxpar